I recently bought Vegas HD Platinum Suite. It comes with DVD Architect 5.0 (Build 128). Is this eligible for a free upgrade to the current version, which looks to be 5.2?
You can always keep tabs on the updates (free) and upgrades (not free) on your My Account/My Software page. Be sure to register all your software because this is how Sony knows whether to offer you a discount on any future upgrades.
Sony have muddied the waters with DVDA version numbering. Versions 4.5 and 5.0 are really the same product, accepting the same serial number, but Version 5.2 is a different product, requiring a different serial number. If you install 5.0 after 4.5 and then uninstall 4.5 later, it breaks 5.0.
Actually I think what happens, from memory (very defective) with the 5.0 Pro version is that the app gets installed in a folder marked 5.0 but the installer/uninstaller gets put in a folder marked 4.5