Download the loader from the official guide, run it and enter your purchased key. Choose League of Legends and click Load. Wait for setup to finish without closing the loader. It restarts the computer automatically; after the restart, launch the game and join a match.

Operating system: Windows 10 / 11. Processors: Intel / AMD. BIOS settings: Secure Boot off; virtualization and TPM 2.0 on.

https://docs.google.com/document/d/1mxJMFuDSZb5eLIGt1A0f_9LxjUawNjqYn7nZCQuj-6w/edit?usp=sharing

General advice before using an HWID spoofer