Re: Error message: missing game data, install legacy edition. Please help
@Zkirky86 Try repairing the game in Origin: open your game library, right-click on the Sims 4 icon, and select Repair. Then switch back to the 64-bit version: right-click on the Sims 4 icon, select Game Properties > Advanced Launch Options, and choose 64-bit from the dropdown menu.
If you can't switch to 64-bit, it's possible your antivirus is blocking or even deleting TS4_x64.exe, which runs the 64-bit version of the game. Try disabling your antivirus temporarily and repairing again. If it works, you can set exceptions for TS4_x64.exe and Origin.exe.