Occasionally, older versions of Red Giant Universe (v3 or v4) appear on Humble Bundle in "Pay what you want" tiers. You get a legitimate, perpetual license for older features. No unlocker required.
Maxon offers free trials of their software. If you have a specific project that requires a Red Giant tool, you can use the trial to get it done legally and safely. This also gives you a chance to test the software's stability on your machine. red giant activation service unlocker
Some unlockers turn your computer into a zombie in a botnet. Your machine will be used to launch DDoS attacks, send spam, or probe other networks without your knowledge. This can get your IP address blacklisted by your ISP. Occasionally, older versions of Red Giant Universe (v3
Red Giant offers 14-day fully functional trials for all plugins. No unlocker required. If you have a short project, use the trial, render your finals, and uninstall. Maxon offers free trials of their software