Only the most recent version in the release tab is supported.
Found here: https://github.com/UnlegitSenpaii/FAE_Linux/releases
To report a vulnerability, you can create an issue on the issues page.
If it is urgent, I will try to respond to you in the evening (CET) else on the weekends.
For non-public disclosure, you can send me a Discord DM at senpaii.dev.