so i've seen this around the interwebz a couple times lately after i had experienced it last week when setting up a base map to tune a 2003 softail. trying to flash the downloaded base tune from DJ fails with a no vin error. i'd not seen this before. the reason i was attempting to update to a newer map was the original was still untouched, a software level 93. level 105 was the latest usable for the original Delphi ECUs. problem is that the current maps for all 02-05 available on the PV or from DJ tune library online are all level 127. these are only for 2002-2005 with the newer stock replacement ecm (the -11). this cal is not compatible with the old ecu, the error PV gives you is sort of vague and unhelpful.
if you already have a software level 105 saved someplace, use that as a baseline vs the ones in the PV or from DJ. DJ can probably also give you a base map with the 105 cal level if you email them but i didn't have that kind of time. i don't think normal users can pull the stk file from the ecu and save as a PVT so they are probably stuck with emailing DJ for support, although maybe they can save the stk tune to a slot in the PV and get it that way? can't remember if that works..... but to update to a 105 they'd have to do one of the above options.