These errors appear on startup (when loading the XMesh plugin), right? I don’t think this is a license error. A license error wouldn’t appear until later, when you actually try to save a mesh.
Edit: is it possible that you are attempting to load the new build alongside an older build? This will cause the same “Unexpected Internal Failure” error that you reported.
Hmm could be, ill check! It happens on random machines, so it could either be the redistributable, or a preinstalled xmesh being loaded from somewhere else