The discussion of "whether one should" use Supermium's password manager is sort of irrelevant to @kwisomialbert's question anyway. He "does" want to use it but it's not working for him. So, is password manager broken in the latest version? (I don't have Supermium myself so I can't check.)
As for losing your passwords if the HDD crashes, I know; make regular backups, yada yada. But again, the computer is supposed to do some of the work for you, and storage isn't that expensive. So why doesn't the password manager make multiple copies of your passwords, ideally on different drives if you have them?
For that matter, why isn't mirroring/RAID more common in PCs today, so if an HDD fails, you just replace it and let the PC take care of rebuilding everything? Two or even three 2.5" drives don't cost that much or take up much space.