For the installer issue, try completely uninstalling Opus, rebooting, then installing it again. (If you have config changes you want to preserve, backup your config first via Settings > Backup & Restore, which you can also use to load the backup into the new version.)
With the crash, please send us the logs for analysis: Automatic crash logs (for bug reports)
For the Properties dialog, does the same happen in File Explorer if you do the same sequence of actions? That sounds like something in either Windows itself or a shell extension that adds itself to the properties dialog has gone wrong.