Can't install the game

hello guys,iam new to this server i really wanna play it i have the turkey and mena server and it's updated but when i download the downgrade and start the game it says The file is corrupted. If it persists, please run file-recovery from the launcher and then if i force check the game it nearly download additional 18gb but i closed the launcher cuz the download is very slow and my internet cannot afford that so please tell me what to do

 

Force check is the only solution if the files are corrupted.

 

ok thx