I should have added more. I did edit in some data after.
So lets get started.
Do you have multiple steam libraries setup. Since you are using multiple drives I am going to guess you do.
If you want to copy a game from one steam library to another taking the game along from the steamapps folder(default location is c : \ program files (x86) \ Steam \ Steamapps \) will not work because steam also look for a file with an
.acf extension when it finds your games.
If you want to avoid having to reinstall, you also have to move this to the other steam library(into the steamapps folder that is created.).
Example image with these ACF files.
Now getting an appid or subid from steam it self. When you visit the steam store in any web browser the id is part of the web address
Example image.
As long as you bring along that file with your game and place them in the right folder(steamapps/common for most games the ACF stays in steamapps), things should work fine.
You should always close steam before moving data like this.
I hope this helps, but if you already started download it may be too late for this game.