I think the reason we can't play on the main is that the main app is currently updating. Now the main app just made its update, we should wait for the modder to post the modded update as well.
If you don't see the link is because you click the reply post, go on the search option and put Frag Pro Shooter and Go Down until u see the Axey Post, now you can see the image and the like option to download.