DAB installing + Coding

[BubbleB]

Hi Guys,

Proud owner of a E60 520i (2004, business navigation) here 
Like several of you might experience, FM bands on the radio are going to stop. 
So I was checking out the options.

Found this one and ordered (expecting it to arrive):
https://cartain.de/index.php/de/produkte/dr700bmw
Anyone installed already?

Installing will be no issue (hardware); installation (software) will be challenge.
My car has no DAB so I have to add $654 I was told.
Anyone who already did it?

Thanks!!