Hello
1- Install the programs from the links I gave you below
1.1-
1.2-
(Unzip it to the folder, then run the install_all.bat script as administrator.)
2- Clean the %temp% , temp and prefetch folders.
3- You need to update your gameloop version to the latest version (4.1.117.90).
4- Select Gameloop -> Settings -> Engine/Engine Settings -> DirectX+.
5-Then restart your computer and if you have Adblocker, Windows Security, Antivirus programs, Riot Vanguard and FaceIT Anticheat, turn them off and try again.
If your problem is not resolved, you can contact me privately.