B4X FEED Android version versus UI B4A/B4X versions

[practicalsoft]

I made an app for an terminal with android 8, a few years ago.
Now I had to change a few lines. I used the latest B4A/B4X version.
I could not install the updated app.

Using my old laptop with old B4A gui worked like a charm. I changed the old code and could install the app.

But now, how can I update older apps, using the newest version of B4A/B4X?
Or do I have to keep older version of B4A/B4X?

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