SOny Sat Nav. New map download.

[Seany]

I have this about a year now.  A bit patchy, but generally OK.  It is now interrupting me every so often telling me there is a software update, but that costs £30 or something.  Not a hope am I paying it.  Has anyone a handier way of getting it?  Maybe for free? An old rogue download site.  It's not on Limewire, though, not Mininova.