This suggests you experienced a bad install because they are the exact same build. The installer is simply a fancy zip extractor.
The installer has an option “Remove Old Program Files.” If you turned that off it could be a problem, but it even if you did not there can be a problem sometimes if files are locked. Usually, the installer complains about that. In any case, the sure way to get a clean reinstall is to first reboot, do not start Shotcut, and then reinstall.