Ah! I don't have the older version on hand but I hear these saves are located in the "Android/data/Eternum" directory. They have names like 1-1-LT1.save with different numbers throughout. Can you find them there? If yes, I'll add that to the guide.
If you find the saves, copy all of them into a different folder (just in case) and then just follow the instructions above, from top to bottom.