diff --git a/.github/workflows/CD.yml b/.github/workflows/CD.yml
index 5023bf5654..b5ca5aa131 100644
--- a/.github/workflows/CD.yml
+++ b/.github/workflows/CD.yml
@@ -48,6 +48,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           ref: ${{ inputs.flex_ref }}
+          
+      - name: Downgrade Wix Toolset
+        shell: cmd
+        run: choco install wixtoolset --version 3.11.2 --allow-downgrade --force
 
       - name: Checkout Installer
         uses: actions/checkout@v4
@@ -60,21 +64,21 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: sillsdev/FwHelps
-          ref: ${{ inputs.helps_ref }}
+          ref: ${{ inputs.helps_ref || 'develop' }}
           path: DistFiles/Helps
         
       - name: Checkout Localizations
         uses: actions/checkout@v4
         with:
           repository: sillsdev/FwLocalizations
-          ref: ${{ inputs.l10n_ref }}
+          ref: ${{ inputs.l10n_ref || 'master' }}
           path: Localizations
         
       - name: Checkout liblcm (for l10n)
         uses: actions/checkout@v4
         with:
           repository: sillsdev/liblcm
-          ref: ${{ inputs.lcm_ref }}
+          ref: ${{ inputs.lcm_ref || 'master' }}
           path: Localizations/LCM