I need help iv tryed everything and nothing is working

help me out guys. im trying to do a USP Mod for WAW Zonbies. got have my profile in Horizon. but every time i try to drag the mod game save it says Access to the path (File Name) is denied. i have no idea how to fix it. if i run it on Administrator i can not drag and drop. when i right click and take off the read only click apply and then ok i recheck it and it is on read only again. if i dont run it on Administrator it will let e drag it over but gives me the Access to the path (File Name) is denied. i have uninstalled it and reinstalled it twice. and i restart it after each thing i do. can anyone think of how to fix this dam thing.