If you have a perpetual license (not a 365 subscription) of VEGAS Pro 19 you can have two simultaneous installations/activations of that version. From this FAQ, item 9:
"You can use VEGAS Pro (14.0 and later) simultaneously on 2 devices. VEGAS Pro 365 can be used on 1 device at a time.
To deactivate a device, so you can activate a different one, visit your MAGIX account > My Products > Show More Details > Deactivate. This option can be used only once a month.
In VEGAS Pro 14.0 or later, you can also choose Deactivate the Software on this PC from the Help menu This option can be used as often as you wish. An internet connection is required."