Thread: iGO Basarsoft 9.18.27.717219 - 18.oct.2017

Android 8 - that is key factor.
Unless the device manufacturer has strictly anticipated, you must install iGO from internal memory. Those are Android system restrictions.
OK, you can try with some of SD moded version, like [Only registered and activated users can see links. ]. You must follow the instructions very precise.
But, on some devices, although the apk has been modified, restrictions in the system do not allow the use software from the card noway.

So, first try with SD moded edition.
If not work, uninstall properly. Move base folder in internal memory, install form there.
Main software package is 50-60MB, every device have so much free space.
Maps (content) can be used from card, described here:
[Only registered and activated users can see links. ]
Read carefully. Pay attention to details.