need step by step guide - installing latest kodi and have icon on home screen

i want to update my version of kodi, i think i have an old verison installed. how can i update it and maintain the icon on homescreen?

is there a guide? the last time i did it was months ago and unsure if there have been changes to doing this / easier method...
to be honest i can't remember exactly, but i am using a llama / ikon tv replacement i believe)

thanks