I just click the “News” page, its b361 third “patch” down, highest is latest.
I download and store each update as they become available, so if I need to roll back then easy enough.
https://www.vegascreativesoftware.info/us/forum/vegas-pro-update-history-so-far--104998/
(Courtesy of Nick Hope)
Linked in point 6 here https://www.vegascreativesoftware.info/us/forum/vegas-pro-faqs-and-troubleshooting-guides--104787/
Thanks!