@Boki_Srb Not lazy, I am just not good in searching and neither the search option nor your link comes up with the exact version you mention.
You are right about my lack of "android" knowledge but so far each and every app or iGO version just installed the way I would expect, I find
it very very strange that only iGO versions now require some secret installing procedure.

I check the info you gave and see where it ends, a quick peek shows that another user have very similar problem as I have.
FYI I followed advise I've got from another, which was grant iGO access to several folders and so, but during install it already asked for that and the permissions where already given.

BTW If answers are already given....,but these answers are spread all over this website, yup people might not find these answers especially when the search option returns no results.
Maybe a centralized "how to install" is an idea?
I agree with you that it must be possible to make it work on my phone too, unfortunately I have no idea how but I will try everything you said. Thanks