The PortableGit.7z SourceTree downloads fails to extract. The archive is fine. I used 7zip to test it, so may bethe problem is a file can't be deleted before its replacement is written.

A worse problem, however, is that after the failed update, the previous embedded git isn't restored (I think), and I started to get a failure running sh.exe. SoureTree runs sh.exe quite often it seems, and so as soon as I push OK, I get the same error over and over.

Setting my git to system git didn't fix the repeating sh.exe error.