I received an email from them telling me that my go 520 will be no longer supported because of map sizes getting bigger.
I have an 8 gig sd card in mine which is plenty and not tried to see if a larger one is supported so I don't understand their reasoning.
So much for lifetime updates.
Just installed the latest truck map on it from this site with no problems and just logged onto tomtom home (the 2.8 patched version that does not force an update to it) and installed the latest mapshare updates.