You can map a partition to a folder on an NTFS drive.
1. Create a folder where the game wants to install, exactly as it wants to name it.
2. In Disk Management console, shrink the partition on another drive, then create a new partition using the left over space and format it.
3. Right click on the partition you just created and select "Change Drive Letter and Paths" and click Add on the window that pops up.
4. Browse to the folder you created or copy and paste the name of it into the dialog box and click OK
5. install the game.