Hi Team, I have just had the same issue, after upgrading SD+, that someone else had way back in 2007 and the fix is the same:
Delete the Extracted folder from the
[ServiceDesk-Home]\applications folder.
This also happened about two years ago.
Surely the upgrade process could fix/clean-up this itself to stop this happening, this is after all 2016, nine years after the same problem was happening!!!
Cheers...Ian