Replacing the heidisql.exe with heidisql.r3294.exe update works out fine.
Portable: 5.0.0.3272
Non-Portable: 5.1.0.3294
Updating from my previous version to 3294 didn't complete the download and installation as before, didn't take note of the buggy version


Thank you for allowing the update to be transferable between the two, mush appreciated!
