I was installed succesful on Samsung S5, after I read o lot of the forums, more simple in another way(sorry my bad english!):
I copied on SD-card whole IGO folder(except the SAVE folder) and apk, and on internal memory in "Android/DATA/IGO" the "SAVE" folder. Then install apk, first was one error, that you ignore, and final the application run without problems.(At the final you must complect with maps, pois, as you want)
I hope I can you help.
Edit later: sorry, I was installed Igo Turkey Basarsoft![Only registered and activated users can see links. ]