Tutorial for getting Nokia Here/Drive maps onto the external SD card on a Lumia 532

Hi guys,

I bought a Lumia 532 for navigation purposes for my parents,
as they have absolutely no clue about smartphones and this
should be the easiest handset to work with. Also, I am totally
new to this operating system, because I am using Android and
iOS.

Now I am searching for a complete tutorial on how to get
the Nokia Here maps saved on the external SD card. It seems,
the old method with Lumia Storage Check Beta is not working
or existing anymore. :(

I found bits of information here and some there, but there is
just no single complete tutorial going from step 1 to x. :\

Thanks a lot in advance.