Pre Isntall

does anyone still have the OnyxPrerequisite files everywhere where I want to download them, they are no longer available.

The link in the error message does not work either because the file no longer exists there

The file is not needed, its included in your installer and the error message is misleading.
If this gets asked it indicates other issues on your PC, like an antivirus blocking things or conflicting newer SQL server installed.
Remove all Onyx drivers, Microsoft SQL servers and reboot / reinstall.
This happens to older installers, there could be conflicts with new Windows builds as well. You are on your own, we do not support them.