>>>
A clean copy is requested; deleting contents of d:\Jenkins\workspace\...
Populating clean workspace...
Successfully checked out 15 files!
>>>

However, from time to time, especially when the server has some load or chained builds, some random file is missing.
In this case, only 14 files were found in the Workspace, even though the plugin claimed it had checked out 15 files.
The missing file is called "Product.wxs". Attached the SCM logs for this build (could consider making the logs human readable in future versions, instead of this binary dump).

Note that this happens ALOT for other build servers we have, both old and with latest Jenkins and plugin versions.