1. Download the files here: https://drive.google.com/open?id ... u_U7oLIIDTCI_bUN3Dg
2. Extract League of Legends.exe and stub.dll from the zip file into your C:\Riot Games\League of Legends\RADS\solutions\lol_game_client_sln\releases\0.0.1.224\deploy folder, overwriting the files that are currently there. Your path may differ slightly depending on where you've installed the game.
3. Join a custom game or use the practice tool to validate that your issue is resolved.