If you want to install both of Mobius Final Fantasy Global & Japan, make sure to install them in different Steam Library, or they will mess each other.
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1. Open Steam Application > Setting
2.Go to Downloads > Steam Library Folders
3. Add Library Folder
Take a note:Set different Steam Libraries in different Drive,
in my case:
Mobius Final Fantasy (Japan) in default folder --> F:\Games\Steam
& Mobius Final Fantasy (Global) in secondary folder --> E:\Steam Library2
Now you are ready to go.
After installed both of them, you can find 2 games in Steam Library, look at descriptions & play the game.