You will have to get rid of the original gacha club or if you have gacha star still do the same thing to get it. If you already did that then try clearing up your storage. If that doesn't/does work let me know!
it doesn't say anything about an update to an existing app, my phone is poop, and I have way too many screenshots because well, Gacha. and I forget to delete old a$$ screenshots. :/
