Vloader

First, back up all your Grab files. You MIGHT lose levels, so you may want to back up your game in order to keep them.

Second, download the latest APK. IT WILL NOT BE NEW GRAB. The APKs are meant to be OLD Grab.

Third, uninstall GRAB. You don't need to go into a lobby, just uninstall it.

Fourth, enter MobileVRStation (or CX, or ZArchiver) and install the APK.

Fifth, WHILE the APK is installing, start installing normal GRAB, and then cancel the install on normal grab BEFORE the APK finishes.

Finally, open up grab again, and play.