I did a test upgrade for my server from jenkins 1.651.2 to 2.7.1. The slaves are auto-connecting swarm slaves, their configuration hasn't changed.

After upgrading, all cmake build projects fail with the following:

ERROR: Install from cmake.org [CMake 3.4.1]: No cmake download known for OS `Windows Server 2012 R2` and arch `amd64`.

I believe this shouldn't happen, for the following reasons:

• the auto-download worked fine with Jenkins 1.6
• the slaves in question still have cmake 3.4.1 installed (from previous builds)
• Windows Server 2012R2 qualifies as Windows OS in https://github.com/jenkinsci/cmakebuilder-plugin/blob/master/src/main/java/hudson/plugins/cmake/CmakeInstaller.java#L373

Any idea what might be going wrong or how to fix this would be appreciated.