AFMF 2.1 requires the game to run in fullscreen without vertical sync.

• V-SYNC OFF
  
• Borderless Fullscreen
  
• 60 FPS

Open the Adrenalin software either from the system tray, or the overlay ingame with the Alt+R hotkey, and go to the Gaming tab. If the game is running, it'll automatically open its settings, but you can manually select it as well.

Inside the game settings for Motorfest, enable AFMF and Anti-Lag. I set it to the highest quality settings, but if your GPU can't handle it, try lowering them.

Since frame generation happens externally, not through the game engine itself, FPS counter overlays like Steam/Ubisoft Connect/Afterburner/RTSS/etc will still show the original 60 FPS.

To see the final framerate after frame generation, use the AMD performance overlay. The default hotkey is Ctrl+Shift+O.

There are 2 useful hotkeys to toggle frame generation (default: Alt+Shift+G) and the performance overlay (default: Ctrl+Shift+O).