vMix comes pre-installed on all instances.
It will prompt you to add your license when you first open the program.
Now you're set to start building your vMix session.
A reminder, one vMix license can be used on two machines at a time. If you are deleting and creating new production modules for shows, and you want to reuse the same licenses, make sure to deactivate them from your old modules.
Go to vmix.com and click vMix Account.
Type in your vMix Key and click Log in.
Scroll down to the Activate section and click the Deactivate button for the machine you want to remove the license from.