downlaod twice?

iludez

so i downlaoded this yesterday checked this morning and it said npt enough disk space so i copied all the files it had already downlaoded from my ssd to my hdd then tried to reinstall but its now redownloading 22gbs again?what the hells going on here.i dont have a huge data plan so worrying me that itl be 50gbs of data used.anyone able to help>?