Nick Howitt wrote:

Unfortunately, if you reinstall, PHP 5.6 is no longer available. This is outside our control. The work that was never done was to change the app not to show 5.6 unless it was already installed. On the other hand, 7.2 is now available. Lose one and gain one.

This is probably what confused me the most. I have a system that was installed before and still runs fine, but doesnt show this error. So I was under the impression that I had done something wrong.