diff --git a/HISTORY.md b/HISTORY.md
index 55a6f985e63..a779c84f558 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,12 @@
 # Keyman Version History
 
+## 17.0.199 alpha 2023-10-26
+
+* fix(developer): handle xml errors in package compiler (#9821)
+* fix(developer): server download Keyman link (#9822)
+* chore(common): handle invalid XML in kpj-file-reader (#9824)
+* fix(developer): reduce confusion in Unicode fields in touch layout editor (#9839)
+
 ## 17.0.198 alpha 2023-10-25
 
 * chore(common): Add entries from 16.0 HISTORY.md (#9826)
diff --git a/VERSION.md b/VERSION.md
index a2ed5131d52..0de5a09ae58 100644
--- a/VERSION.md
+++ b/VERSION.md
@@ -1 +1 @@
-17.0.199
\ No newline at end of file
+17.0.200
\ No newline at end of file
diff --git a/common/web/types/src/kpj/kpj-file-reader.ts b/common/web/types/src/kpj/kpj-file-reader.ts
index cffa2069c64..4457992e227 100644
--- a/common/web/types/src/kpj/kpj-file-reader.ts
+++ b/common/web/types/src/kpj/kpj-file-reader.ts
@@ -21,7 +21,12 @@ export class KPJFileReader {
       emptyTag: ''
     });
 
-    parser.parseString(file, (e: unknown, r: unknown) => { data = r as KPJFile });
+    parser.parseString(file, (e: unknown, r: unknown) => {
+      if(e) {
+        throw e;
+      }
+      data = r as KPJFile;
+    });
     data = this.boxArrays(data);
     for(let file of data.KeymanDeveloperProject?.Files?.File) {
       // xml2js imports <Details/> as '' so we will just delete the empty string
diff --git a/developer/src/kmc-package/src/compiler/kmp-compiler.ts b/developer/src/kmc-package/src/compiler/kmp-compiler.ts
index b26643e1781..f2df4c881fc 100644
--- a/developer/src/kmc-package/src/compiler/kmp-compiler.ts
+++ b/developer/src/kmc-package/src/compiler/kmp-compiler.ts
@@ -29,6 +29,7 @@ export class KmpCompiler {
   public transformKpsToKmpObject(kpsFilename: string): KmpJsonFile.KmpJsonFile {
     const kps = this.loadKpsFile(kpsFilename);
     if(!kps) {
+      // errors will already have been reported by loadKpsFile
       return null;
     }
     return this.transformKpsFileToKmpObject(kpsFilename, kps);
@@ -48,11 +49,19 @@ export class KmpCompiler {
         let parser = new xml2js.Parser({
           explicitArray: false
         });
-        // TODO: add unit test for xml errors parsing .kps file
-        parser.parseString(data, (e: unknown, r: unknown) => { if(e) throw e; a = r as KpsFile.KpsPackage });
+
+        try {
+          parser.parseString(data, (e: unknown, r: unknown) => { if(e) throw e; a = r as KpsFile.KpsPackage });
+        } catch(e) {
+          this.callbacks.reportMessage(CompilerMessages.Error_InvalidPackageFile({e}));
+        }
         return a;
     })();
 
+    if(!kpsPackage) {
+      return null;
+    }
+
     const kps: KpsFile.KpsFile = kpsPackage.Package;
     return kps;
   }
diff --git a/developer/src/kmc-package/src/compiler/messages.ts b/developer/src/kmc-package/src/compiler/messages.ts
index 2eeaa6e0618..cec733d3d84 100644
--- a/developer/src/kmc-package/src/compiler/messages.ts
+++ b/developer/src/kmc-package/src/compiler/messages.ts
@@ -123,5 +123,9 @@ export class CompilerMessages {
   static Hint_PackageContainsSourceFile = (o:{filename:string}) => m(this.HINT_PackageContainsSourceFile,
     `The source file ${o.filename} should not be included in the package; instead include the compiled result.`);
   static HINT_PackageContainsSourceFile = SevHint | 0x001D;
+
+  static Error_InvalidPackageFile = (o:{e:any}) => m(this.ERROR_InvalidPackageFile,
+    `Package source file is invalid: ${(o.e ?? 'unknown error').toString()}`);
+  static ERROR_InvalidPackageFile = SevError | 0x001E;
 }
 
diff --git a/developer/src/kmc-package/src/compiler/windows-package-installer-compiler.ts b/developer/src/kmc-package/src/compiler/windows-package-installer-compiler.ts
index 8f920535bbf..1a5f4ebe6b8 100644
--- a/developer/src/kmc-package/src/compiler/windows-package-installer-compiler.ts
+++ b/developer/src/kmc-package/src/compiler/windows-package-installer-compiler.ts
@@ -39,6 +39,10 @@ export class WindowsPackageInstallerCompiler {
 
   public async compile(kpsFilename: string, sources: WindowsPackageInstallerSources): Promise<Uint8Array> {
     const kps = this.kmpCompiler.loadKpsFile(kpsFilename);
+    if(!kps) {
+      // errors will already have been reported by loadKpsFile
+      return null;
+    }
 
     // Check existence of required files
     for(const filename of [sources.licenseFilename, sources.msiFilename, sources.setupExeFilename]) {
diff --git a/developer/src/kmc-package/test/fixtures/invalid/error_invalid_package_file.kps b/developer/src/kmc-package/test/fixtures/invalid/error_invalid_package_file.kps
new file mode 100644
index 00000000000..e18eaa26a06
--- /dev/null
+++ b/developer/src/kmc-package/test/fixtures/invalid/error_invalid_package_file.kps
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Package>
+  <System>
+    <KeymanDeveloperVersion>15.0.266.0</KeymanDeveloperVersion>
+    <FileVersion>7.0</FileVersion>
+  </System>
+  <Info>
+    <Name URL="">SENĆOŦEN (Saanich Dialect) Keyboard</Name>
+    <!-- error_invalid_package_file -->
+    <Copyright URL="">© 2019 National Research Council Canada & this test</Copyright>
+    <Author URL="mailto:Eddie.Santos@nrc-cnrc.gc.ca">Eddie Antonio Santos</Author>
+    <Version>1.0</Version>
+  </Info>
+  <Files>
+    <File>
+      <Name>basic.kmx</Name>
+      <Description>Keyboard Basic</Description>
+      <CopyLocation>0</CopyLocation>
+      <FileType>.kmx</FileType>
+    </File>
+  </Files>
+  <Keyboards>
+    <Keyboard>
+      <Name>Basic</Name>
+      <ID>basic</ID>
+      <Version>1.0</Version>
+      <Languages>
+        <Language ID="KM">Khmer</Language>
+      </Languages>
+    </Keyboard>
+  </Keyboards>
+</Package>
diff --git a/developer/src/kmc-package/test/test-messages.ts b/developer/src/kmc-package/test/test-messages.ts
index f9649e9c090..24fb658b599 100644
--- a/developer/src/kmc-package/test/test-messages.ts
+++ b/developer/src/kmc-package/test/test-messages.ts
@@ -226,4 +226,11 @@ describe('CompilerMessages', function () {
       CompilerMessages.HINT_PackageContainsSourceFile);
   });
 
+  // ERROR_InvalidPackageFile
+
+  it('should generate ERROR_InvalidPackageFile if package source file contains invalid XML', async function() {
+    testForMessage(this, ['invalid', 'error_invalid_package_file.kps'],
+      CompilerMessages.ERROR_InvalidPackageFile);
+  });
+
 });
diff --git a/developer/src/kmc/src/util/projectLoader.ts b/developer/src/kmc/src/util/projectLoader.ts
index 078f2e31ded..10cd58fc818 100644
--- a/developer/src/kmc/src/util/projectLoader.ts
+++ b/developer/src/kmc/src/util/projectLoader.ts
@@ -44,8 +44,9 @@ function loadDefaultProjectFromFolder(infile: string, callbacks: CompilerCallbac
 function loadProjectFromFile(infile: string, callbacks: CompilerCallbacks): KeymanDeveloperProject {
   const kpjData = callbacks.loadFile(infile);
   const reader = new KPJFileReader(callbacks);
-  const kpj = reader.read(kpjData);
+  let kpj = null;
   try {
+    kpj = reader.read(kpjData);
     reader.validate(kpj);
   } catch(e) {
     callbacks.reportMessage(InfrastructureMessages.Error_InvalidProjectFile({message: (e??'').toString()}));
diff --git a/developer/src/server/src/site/packages.js b/developer/src/server/src/site/packages.js
index 9a13b1afacc..2255fe9ebd6 100644
--- a/developer/src/server/src/site/packages.js
+++ b/developer/src/server/src/site/packages.js
@@ -11,12 +11,12 @@ menuDropdown.onclick = (value) => {
   menuDropdown.set(''); // we never show an 'active' package
   if(value == '#install-keyman') {
     let href = '';
-    switch(keyman.util.device.OS) {
-      case 'iOS':     href = 'https://keyman.com/go/developer/'+versionMajor+'/ios-app'; break;
-      case 'Android': href = 'https://keyman.com/go/developer/'+versionMajor+'/android-app'; break;
-      case 'Linux':   href = 'https://keyman.com/linux/download'; break;
-      case 'Windows': href = 'https://keyman.com/go/download/keyman-windows'; break;
-      case 'MacOSX':  href = 'https://keyman.com/go/download/keyman-mac'; break;
+    switch(keyman.config.hostDevice.OS) {   // note: KeymanWeb internal API
+      case 'ios':     href = 'https://keyman.com/go/developer/'+versionMajor+'/ios-app'; break;
+      case 'android': href = 'https://keyman.com/go/developer/'+versionMajor+'/android-app'; break;
+      case 'linux':   href = 'https://keyman.com/linux/download'; break;
+      case 'windows': href = 'https://keyman.com/go/download/keyman-windows'; break;
+      case 'macosx':  href = 'https://keyman.com/go/download/keyman-mac'; break;
       default:        href = 'https://keyman.com/downloads'; break;
     }
     location.href = href;
diff --git a/developer/src/server/src/site/test.js b/developer/src/server/src/site/test.js
index 60a27cc484f..6014c8ab264 100644
--- a/developer/src/server/src/site/test.js
+++ b/developer/src/server/src/site/test.js
@@ -216,14 +216,14 @@ window.onload = function() {
 
     if(newOSK) {
       document.getElementById('osk-host').removeChild(newOSK.element);
-      keyman.osk = null;
+      keyman.osk = null;  // Note: undocumented KeymanWeb API
     }
 
     // Create a new on screen keyboard view and tell KeymanWeb that
     // we are using the targetDevice for context input.
-    newOSK = new keyman.views.InlinedOSKView(keyman, { device: targetDevice });
-    keyman.core.contextDevice = targetDevice;
-    keyman.osk = newOSK;
+    newOSK = new keyman.views.InlinedOSKView(keyman, { device: targetDevice });  // Note: KeymanWeb internal API
+    keyman.core.contextDevice = targetDevice;  // Note: KeymanWeb internal API
+    keyman.osk = newOSK;  // Note: undocumented KeymanWeb API
 
     if(document.body.offsetWidth < targetDevice.dimensions[0]) {
       newOSK.setSize('320px', '200px');
@@ -237,8 +237,8 @@ window.onload = function() {
 
   keyman.addEventListener('keyboardchange', function(keyboardProperties) {
     if(newOSK) {
-      keyman.osk = newOSK;
-      newOSK.activeKeyboard = keyman.contextManager.activeKeyboard;  // Private API refs on both sides
+      keyman.osk = newOSK;  // Note: undocumented KeymanWeb API
+      newOSK.activeKeyboard = keyman.contextManager.activeKeyboard;  // Note: undocumented KeymanWeb API refs on both sides
     }
     keyboardDropdown.set(keyboardProperties.internalName);
     window.sessionStorage.setItem('current-keyboard', keyboardProperties.internalName);
@@ -284,7 +284,7 @@ function unloadKeyboardsAndModels() {
   const lastModel = keyman.core.activeModel;
   if(lastModel) {
     console.log('Unregistering model '+lastModel.id);
-    keyman.removeModel(lastModel.id);
+    keyman.removeModel(lastModel.id);  // Note: undocumented KeymanWeb API
   }
 
   modelDropdown.removeAll();
diff --git a/developer/src/tike/xml/layoutbuilder/builder.xsl b/developer/src/tike/xml/layoutbuilder/builder.xsl
index 2d6f5299cd1..3b75cd81a3e 100644
--- a/developer/src/tike/xml/layoutbuilder/builder.xsl
+++ b/developer/src/tike/xml/layoutbuilder/builder.xsl
@@ -108,7 +108,7 @@
         </div>
 
         <div class='toolbar-item' id='key-cap-unicode-toolbar-item'>
-          <label for='inpKeyCapUnicode'>Unicode:</label>
+          <label for='inpKeyCapUnicode'>Text Unicode:</label>
           <input id='inpKeyCapUnicode' type='text' size='16' />
         </div>
 
@@ -118,7 +118,7 @@
         </div>
 
         <div class='toolbar-item' id='key-hint-unicode-toolbar-item'>
-          <label for='inpKeyHintUnicode'>Unicode:</label>
+          <label for='inpKeyHintUnicode'>Hint Unicode:</label>
           <input id='inpKeyHintUnicode' type='text' size='16' />
         </div>
 
@@ -221,7 +221,7 @@
           <input id='inpSubKeyCap' type='text' size='8' />
         </div>
         <div class='toolbar-item' id='sub-key-cap-unicode-toolbar-item'>
-          <label>Unicode:</label>
+          <label>Text Unicode:</label>
           <input id='inpSubKeyCapUnicode' type='text' size='16' />
         </div>
         <div class='toolbar-item'>