1. First Download winrar -> https://www.win-rar.com/
2. Install Winrar App on Your PC
3. Download This Text File rarreg.key
4. Hold windows key and r or just search on windows search "run" and type : C:\Program Files\WinRAR to get into the WinRAR directory.
5. Copy and paste the rarreg.key into this directory and confirm it as admin
Now you have a lifetime license