Perpetual licenses don't expire, so it doesn't matter when you purchase more licenses, as they do not need to be co-termed.
You can simply make your purchase through our webstore:
The order numbers will be different but you will still be able to easily manage all of your licenses from your dashboard using the same account.
To ensure a smooth process, please make sure to use the email address associated with your account.
And of course, if you need a quote for your purchase, we are more than happy to provide one for you. Just email [email protected].