[Assassin]

You may have to look for the directory and have to manually launch the game from its current directory. The steam should automatically add the new source to the library. If not, you will just have to manually launch it

This led me to another problem and thats when i attempt to launch the game i get an error message "Failed to find steam" and opens a page to steam store, but the good thing is that i managed to fix this and can open the game from the directory only not from steam library
Thanks for the help