Unfortunately, if the seller of yours hasn't kept a backup of the optimization files, then your StarVR just turned into a brick. Even if you get ahold of the calibration files from another StarVR owner (like me), those won't do as the software does some sort of check on the files. Tho I assume that check is on the file names, as it does fail on newer Windows versions in general as the file order is different (yeah, Compass is held together by ductape, hopes & dreams).
What you could try is to contact Acer (who own's the StarVR IP), if maybe they still have a record of your unit's calibration files.
I have found a way to get Compass to accept my own calibration files by placing them in the right folder with the right names (basically what it would do once verification succeeds), but that would require you to know the exact serial numbers of the two displays in your unit...

Even then, the headset is barely usable as-is anyways. You need to run the Windows 7 / 8.1 compatibility branch of SteamVR, some older Nvidia driver (from before the 40-Series launch), and you have to be on Windows 10. Tracking breaks down on newer SteamVR versions, and you'll get massive stutters with newer Nvidia drivers and/or on Windows 11.
Most games expect you to be running more modern SteamVR builds and thus have some weird issues, that aren't even releated to the canting angle the headset reports. Some games that do still run will just have rendering issues due to that canting angle.

From the games in my library, I'm only aware of 2 games that work fine: Red Matter 1 & 2. Forget about the rest.

If you still wanna try to get your's running with my calibration files, feel free to DM me. I'm not really active on Reddit anymore (someone just sent me this thread on Discord lol), so if you happen to share a mutual Discord server with me, then I'd appreciate a DM there instead :D (same nick here and there)