Join Date: Jul 2005
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The map discs are purely map data, they don't update the software at all. If it doesn't like the new disc, just return to using the old one and you'll be right back where you started.
I know you haven't asked for this, but if anyone's thinking of offering you a CD-R copy of their disc, then I'd like to stress that this amounts to copyright theft and not permitted on this site. On the other hand, if someone who has already upgraded is prepared to give/sell you their old genuine disc, then that should be fine.
Failing that, the Laguna FAQ has a link to a reliable source of genuine TMC enabled, up to date discs at much less than the official Renault prices. See my sig below for the link to the FAQ.
Currently in Horatio's garage:
2010 Laguna III Initiale.