@Richard-Ciliberto, if you go here: C:\Program Files\VEGAS\VEGAS Pro 20.0 and scroll down to Vegas200.exe, is it there? If so, what happens when you double left mouse button click on it?
@Richard-Ciliberto ... Are you clicking on the .veg project file from Windows Explorer? If yes, your Windows default program for .veg files is likely still Vegas Pro 19. If so, go to the Windows default apps window and change the default app for .veg from VP19 to VP20.
@Richard-Ciliberto I personally keep the last version of Vegas still installed on my computer just in case I run into something "different". It really doesn't take up much space.
I do this until I am fully satisfied that the latest and greatest works for me on my computer with the way I work and what I use.