How Can I Upgrade My PublishPress License?
It is possible to move to a higher-level PublishPress license. For example, if you have a single site license and want to add more sites, you are welcome to do that.
First, log in to PublishPress.com and click the “Your Licenses” link:
Next, click the “View Upgrades” link:
Now you’ll be presented with your Upgrade options. The full value of your current subscription will be used as a discount on the upgrade price.
Click on the “Upgrade License” link for the upgrade of your choice. You will now be in the checkout process, and can complete your upgrade.