Just got a new 2555LT and did the one time free update to the current North America 2013.20. For anyone's interest, for the SID files, it only uses the External Point Addressing 2656080A.SID, InstaSearch 3157060A.SID, and trafficTrendsv3 3406050A.SID. The AddressSearch and FastRouting SIDS are not used.