Cant use "Install version from Unity Hub"

I want to download unity 5.6.3p1 to mod a game. But I can’t download it in the archive using the green “Unity Hub” button. I suspect it’s because I have downloaded unity hub not to my C: drive because I was running low on space. I tried downloading the installer but since I wasn’t the administrator I can’t install it without the password.

I found the answer. use 7zip to extract the files from the installer. works for me