1. Make your steam offline.
Just click offline in the left-up corner of “steam” menu.
2.Find your game .acf file.
Assuming G disk is your old steam library. In the directory, G:\SteamLibrary\steamapps\, you find “appmanifest_2358720.acf” file.
You could query the game number id on the steam website. In this case, this file is about “black myth: WuKong”.
3.Change the state.
Open the file, find “StateFlags”, and change the any other state number to 4.
Known state: 4. All update; 6.unknown state, could run game; 38, an unknown state, need to update, couldnot run the game.
4.After succeed move the game, change the state code again.
“appmanifest_2358720.acf” is in your new directory. You should do step 3 to lunch the game in new location.