Last week, when the link above was working, the upgrade price was $100 less, and it seemed to work for all prior Vegas versions, if the serial number had not been used for a previous upgrade. You may want to call Sony directly and see if they will still offer the reduced price upgrade.
US, Canada, and the US Virgin Islands:
English language service
800.577.6642 (toll free)
8:00 a.m. to 6:00 p.m. CST, Monday through Friday
Just got a new link:
https://www.sonycreativesoftware.com...&keycode=64060