Oculus really dissappointed with only allowing Oculus Home installs to your c:\ drive, and then only allowing games to be installed there too. I have a workaround though!
Originally, I tried creating a junction from Oculus Home's intended install directory, but the installer just clobbered it. I made a feeble attempt and renaming and moving the directory, but things were in use and I didn't really want to solve that.
So I settle for creating a junction from the Software directory to another drive in my machine.
My recommendation is to make sure you quit all Oculus software, then copy the Oculus\Software directory to your big drive. Rename the original Software directory, just to be on the safe side.
Then open a command prompt as admin and run the following command, making sure to replace the second path with your intended game storage location.
mklink /J "c:\Program Files (x86)\Oculus\Software" "full path to your copied Software directory"
Run Oculus home, run a game that works. Make sure it still works, now download a new game and make sure it's going to the larger drive. Make sure that runs and works.
Now you can probably safely delete the original, renamed Software directory.
I tested with a previously downloaded Lucky's Tale game and save file. Seemed fine
Downloaded Farlands and tested it, seemed fine
This would still somehow clobber your safe file and game downloads, so use with caution, on something you wouldn't cry over losing.