[Koha] Looking for "How to step-by-step upgrade from Koha 3.02 Livecd version running on GNOME 2.33.0 to the latest Koha 3.6

[Raphael Muonga]

I am running Koha 3.02.00.004 Linux GNOME  which was installed by
using Koha 3.2 x86 r6 livecd.
I would like to upgrade to the current Koha 3.6.
Can someone walk me thru step-by-step  how to upgrade without loosing
any data/database and important files?

Thanking you in anticipation.
Raphael.