diff --git a/.github/workflows/full-build.yml b/.github/workflows/full-build.yml
index 3d5320e4cc..a71e9d6a2f 100644
--- a/.github/workflows/full-build.yml
+++ b/.github/workflows/full-build.yml
@@ -13,11 +13,7 @@ on:
     # Using 1 AM UTC to cover EDT (daylight saving time)
     - cron: '0 1 * * *'
   pull_request:
-    branches:
-      - develop
-      - master
-      - os-4.0-dev
-
+    # Any base branch: this is the only macOS/Windows PR CI since Jenkins osx/windows were retired
     types: [ opened, reopened, synchronize ]
   workflow_dispatch:
     inputs:
@@ -1670,6 +1666,15 @@ jobs:
           path: ${{ env.OPENSTUDIO_BUILD }}/signed/OpenStudio*.exe
           if-no-files-found: ignore
 
+      # PRs skip signing, so ship the unsigned cpack EXE for testers; the name avoids windows-publish's download pattern
+      - name: Upload unsigned EXE installer
+        if: github.event_name == 'pull_request'
+        uses: actions/upload-artifact@v7
+        with:
+          name: OS-Unsigned-EXE-${{ matrix.platform }}-${{ github.sha }}
+          path: ${{ env.OPENSTUDIO_BUILD }}/OpenStudio-*.exe
+          if-no-files-found: warn
+
       - name: Upload Signed TGZ installer
         uses: actions/upload-artifact@v7
         with:
diff --git a/Jenkinsfile_develop_osx b/Jenkinsfile_develop_osx
deleted file mode 100644
index d7d18e8711..0000000000
--- a/Jenkinsfile_develop_osx
+++ /dev/null
@@ -1,10 +0,0 @@
-//Jenkins pipelines are stored in shared libaries. Please see: https://github.com/NREL/cbci_jenkins_libs
-
-@Library('cbci_shared_libs') _
-
-// Build for PR to develop branch only.
-if ((env.CHANGE_ID) && (env.CHANGE_TARGET) ) {
-
-  openstudio_incremental_develop_osx()
-
-}
diff --git a/Jenkinsfile_develop_windows b/Jenkinsfile_develop_windows
deleted file mode 100644
index cb285700d5..0000000000
--- a/Jenkinsfile_develop_windows
+++ /dev/null
@@ -1,10 +0,0 @@
-//Jenkins pipelines are stored in shared libaries. Please see: https://github.com/NREL/cbci_jenkins_libs
-
-@Library('cbci_shared_libs') _
-
-// Build for PR to develop branch only.
-if ((env.CHANGE_ID) && (env.CHANGE_TARGET) ) {
-
-  openstudio_incremental_develop_windows()
-
-}