I know that the problem "Access Denied" makes you insane of can't patching the file of the game...editing it...and blah blah blah reason.
So now , i would be teaching you how to fix it. ( PS. I've went insane finding how to fix the problem. Haha )
1st ) Go to your blackshot folder , then right click it .
2nd ) Click Properties , click on Security Tab , click Add.
3rd ) Put any name you like in the blank space , then press enter.
4th ) Click the checkbox under Allow next to Full Control.
5th ) Click Ok.
If you have any error with this , please inform me by replying in this thread.
~Hope it helps~