This short discussion is moved here

Well, all history is present in this topic ...
What I did: [Only registered and activated users can see links. ]
About notifications, [Only registered and activated users can see links. ]
I recommend you flip through the rest of the discussion ... but I get the impression you did it.

The OBB file must be in phone (internal memory, android\data\obb..., put it there after apk installation and before launching the application), otherwise it will be requested to be downloaded from the server. The software cannot function without it.

Before attempting a new installation you must completely clean the system of any traces of the previous ones ...
Unfortunately, this will require maps re-downloading...

As far as I can see, you've done everything you need to do except insert the obb file.
It is possible that there are consequences.

I remembered something.
With such devices, often, the SD card is not an storage extension. It is treated as an external device. Even, with most, there is no possibility of writing in that slot (only the reader). This may not be the case with yours, but the behavior is mostly like that.
So, download only those maps that you really need (I don't know if there is a USA divided by regions).
I guess your device is modern, so memory is not that much of a problem.

P.S.
Maybe you could do the procedure on your phone (if you have an android phone, of course). So if everything turns out as it should, and the appropriate folders and content are created in the internal memory and on the mSD card, then you copy it all (after installation) to the device and SD card.
However, I can't guarantee that the linking will be correct, android can be weird in that regard.