My Friend keeps re-downloading the game

So this has been going on for a few days. My friend was having problems with the launcher so he redownloads it resetting the computer going through it 5 hours later he fix it. But after we had our daily session we turned off the till tonight where it didn't launch it anymore for him I couldn't understand what's going on but this needs to be fixed running it as an admin doesn't work either. Please fix this issue or is there a suggestion to fix this problem so he won't have to redownload it so many times.