so what you have to do is if you have any other gacha clubs (e.g: gacha cute) you have to close it then you should be able to open the gacha club u just installed idk if im right bu i think this is becuase they have the same name (i have 4 gacha clubs and they look like this: 'gacha club' 'gacha club (1)' 'gacha club(2)' 'gacha club (3)') so yeah does that help?