I am sorry I think my English is confusing here. I beg your pardon as it is not my mother language.
Why can't you install the update?
There are numerous reasons for this but mostly it is because of Ren'Py, the game engine we used to create VN games.
For example, I download a game from androidmo.me and now I install the update from itch.io
Both use the MEGA for data transferring. But in android/data folder each uses a different folder name. That is mostly why the problem is happening.
But sometimes it just happens.
How to fix it?
Method 1
If you do not mind losing your saved files and restarting the game, you can just uninstall the old app. And install the new update.
Method 2
But if you do not want to lose the saved files, you can make a copy of your saved files inside android/data/com.freepass.eng
You have to copy it somewhere else before uninstalling the old app. Otherwise, you will lose saved files during uninstallation of the previous version.
After you have installed the new version, you can copy/move or replace your copied save file back into android/data/com.freepass.eng