Since GearVR is no longer supported by Facebook/Meta, you can sideload VRidge for GearVR app. You can download the apk file from HERE.
This method may no longer works
Installing VRidge in Oculus Go and Gear VR is much simpler process now. First of all go to https://riftcat.com, log in with your RiftCat account and visit THIS link to claim your key (keep this tab open or copy/save the key somewhere) - https://riftcat.com/claim/oculus
NOTE: Website code redemption is currently not working. We have notified Oculus of the issue but it's yet to be resolved. For the time being please redeem Oculus Go and GearVR codes via the mobile Oculus App.
Now visit Oculus Redeem website - https://secure.oculus.com/redeem-code where you log in with either your Oculus or Facebook account or register if you don't have an Oculus account yet. After logging in you should be redirected to webpage where you can redeem code as shown in the picture below. Enter the VRidge key, which you acquired in Step 1, and click "Submit". You should see the message "Successfully Redeem Code".
All that's left is to start Oculus Go or Oculus app on your phone, look for "VRidge" which should be in Library "Not Installed" tab. Install VRidge and that's all.
VRidge also supports Oculus Go and Gear VR 3-DOF controller. You can read more about controller support HERE. If you need help setting up RiftCat make sure to check out our tutorial guide HERE or visit our Help Center HERE.
Have fun playing PC VR games with VRidge on Oculus Go and Gear VR!