Download mod > extract from zip folder > f1_2020_modded_pv > copy_paste_mod > 2020_asset_groups, copy this folder and paste it into the f1 2020 folder in your steam folder where your f1 2020 folder is stored if this is done correctly it should ask you to overwrite some files, just click yes and it will all be working when you load up the game. hope this helps.
I might release a corrected performance mod for f1 22 but tbh I wont make the drs any stronger as I belive its good enough considering the cars produce less dirty air, and If you make it any stronger it just becomes impossible to defend which I guess is somewhat closer to real life but thats not always the case as it differs track to track.