These are often dangerous, containing malware or phishing links. Using these keys is not only against the Terms of Service but can compromise your workstation.
If you are trying to get your old project synced or reinstalling a classic version of the software, here is everything you need to know about the current state of PluralEyes 3.5, how licensing works now, and what to do if you've lost your key. The History of PluralEyes 3.5 red giant pluraleyes 3.5 serial number
Even for older versions, sometimes the Maxon App (which replaced the Red Giant Application Manager) can detect previous licenses tied to your email address. Compatibility Warning These are often dangerous, containing malware or phishing
You might find old license keys from 2014, but these are typically "node-locked" or have been deactivated by the manufacturer. How to Recover a Lost Serial Number The History of PluralEyes 3
If you previously purchased PluralEyes 3.5 and simply lost your key, you have a few legitimate paths: