It seems that the update available online on the site renault-multimedia is now 2.2.19.300 as shown in a comment on this page and this post on a German forum.

Still according to this German forum, it says:

Update enthällt einen Bugfix für das DAB Kanal 5C Problem

which means:

The update contains a fix for the 5C DAB channel problem

It would seem that this update has an impact on the reception of digital radio.

According to the site the procedure has not evolved for the update that I describe here.