This is a known issue with Sidequest. Check this link for help.
There seems to be a Sidequest bug, you might have to install obb file twice if it doesn't work the first time!
Unfortunately the new version does not run on the Quest 2. Its 6GB of RAM aren't enough to run the new VR HOT version.
Your Guardian is not set up properly.
Make sure the Developer Mode on your Quest is deactivated.
Do the Guardian Setup on your Quest.
NOW activate Developer Mode and start VR HOT.