GitHub hosted Actions runner was upgraded from Windows Server 2022 to 2025, which no longer has Windows SDK 19041 (Windows 10 2004), it only has 21000 (Windows 11 24H2). Since I want to target Windows 10 and don't know how Windows SDK versions work, I'm rolling back to Server 2022.

Author: Aldaviva

.github/workflows/msbuild.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   build:
-    runs-on: windows-latest
+    runs-on: windows-2022
 
     steps:
     - name: Add MSBuild to PATH