The unzip task of this plugin does not properly close the output stream used to write the file to the hard drive. This causes the writing lock to the file to stay in place until the stream is collected by the garbage collector. This causes random problems in case the files are deleted again soon after, because the lock on the file is still active.

I think I already found the reason for this issue. I will verify it and if I have a working fix I will send in a pull request by this time tomorrow.