If you were unable to update to TurboBid 5.1:

Click the following link to download the TurboBid Updater: https://www.turbobid.net/TurboBidUpdater.exe

Move the updater file to C: > Program Files (x86) > TurboBid 5.0. If it states that this file already exists, please select to override this file.

Now, run TurboBid again and it should install successfully.