Hey there Allen.
When the game surpassed 2gb of size some changes had to be done or android would not allow the instalation of such a "Strange" big file.
Now to make it work make sure you are copying the big .RPA file and paste it in the -- /Android/data/org.ataegina2.the66/files/game -- folder. If the folder doesn't exist, create it.
Then run the smaller .APK file and you should be able to play,
IF you still need help come join the discord, it's easier to help from there.
Cheers!