Welcome to Android Central! To be clear, I'm assuming you're having trouble installing the software for Oculus Home, correct? I wouldn't call Oreo a "really old version" -- most apps these days should still be compatible with Oreo. If you were running Lollipop or KitKat, then that would make more sense.
What exactly are you encountering when you try to install the Oculus software? Do you get an error message? Do you know if Oculus requires Pie to be installed?