In Blender 3.1 we can't run the source_archive_complete because the cmake program is trying to download the packages from svn trunk. However 3.2 (aka master) already changed the version of some of the source packages. For example the OpenXR-SDK. It should be looking for OpenXR-SDK-1.0.17.tar.gz in: https://svn.blender.org/svnroot/bf-blender/tags/blender-3.1-release/lib/packages/ But instead it tries to look for it in: https://svn.blender.org/svnroot/bf-blender/trunk/lib/packages/ Which can't be found since it was replaced with OpenXR-SDK-1.0.22.tar.gz --- Release checklist: https://wiki.blender.org/wiki/Process/Release_Checklist The release checklist was updated to include the new instructions: `In the release branch, update and uncomment BLENDER_VERSION in download.cmake` Differential Revision: http://developer.blender.org/D14292