If you previously purchased PluralEyes 3.5 and simply lost your key, you have a few legitimate paths:
Before spending too much time hunting for a serial number, keep in mind that It was designed for older operating systems (like Windows 7/8 and macOS Mavericks/Yosemite). red giant pluraleyes 3.5 serial number
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 If you previously purchased PluralEyes 3
Are you trying to install PluralEyes 3.5 on a or Mac machine, and which editing software are you planning to use it with? how licensing works now