License ID and password should be on your invoice. V2 was a mid 2011 release date and V3 became availabe January 2013 according to my records. I would think they should be able to provide a copy of your original invoice at 4 years old if you cant find yours. In my opinion the V3 and even more so V4 upgrades provided major enhancements. V4 especially so if you have the pro version.