Having trouble installing

I just purchased blackfyre theme tonight and i was having trouble installing it through my wordpress. i tried to install it in the zip format in the upload section which doesnt work. so i used my ftp program to transfer the theme which worked but when i tried to activate it. it gives me a white screen. cant see my site nor see my admin login or other features. so i had to remove it on my ftp for my site to regain back to normal which worked. i installed other themes and i havent had a problem but when i try to activate blackfyre or live preview it gives me a white screen. i would appreciate if you guys would help me out cause i dont wanna regret wasting 60$ 🙁