So should i delete the app to get the new version or just leave it there.Sorry if i ask too many questions.
You should backup your saves before attempting to update just in case. Savegames are located in:
Code:
\Android\data\*name of app package*\files\saves
The name of the app package can be found by viewing the app info page in android settings. It's sometimes called "APK name" or "Package Name".
If the new version was built by the same person, the new version will overwrite the old and the saves will transfer over automatically. If the new version was ported by someone else, the old version will stay installed and you will have to manually transfer the saves. You should never uninstall the old version of the app before transferring saves is complete because when you uninstall the app you delete the saves too.
For example, If you were using my port of version 29 and now you try to install my port of version 30 that I just posted, it should be as simple as downloading the new APK and clicking "install"; the saves and even the gamestate will transfer over. Next time you open the app you should be EXACTLY where you were in the game(if everything goes to plan).