Hi folks,
I have been able to install this version of Street Pilot on the stock rom Lollipop 5.0 LG G3 to the internal memory, this version also works correctly in landscape mode. However, to install on the external SD required a little more work, the apk for /storage/external_SD/Garmin/ does not work, Instead I needed to use [Only registered and activated users can see links. ] and change the path to:

/storage/external_SD/Android/data/com.garmin.android.apps.gmobilext/files/Garmin

once the apk is installed, open and it will create the necessary file structure in the external_SD. Close StreetPilot and copy
(need to use the stock filemanager or Solid Explorer) the contents of the Garmin folder to:
/storage/external_SD/Android/data/com.garmin.android.apps.gmobilext/files/Garmin/
and StreetPilot should now work from your external SD.
I hope this is clear and can help others who are struggling.