fanukunjai :
I tried but my c:\ drive is an SSD with 126 gb and it a almost full. So I can't install the game into it ☹️
I don't see what the issue is then, if you installed the game on the external drive, and you know you installed it on the external drive, you need that drive connected for it to work. This is like packing a suitcase for a trip, then taking it out of the car before you leave and wondering where your stuff is when you get to the hotel. A game can't run if you remove the drive it's installed on.