The method is a bit different depending on whether you’re using version 2.x or 3.x
For version 2:
– Go to the Microthemer > Preferences page.
– Scroll down to the bottom of the page and enter your PayPal email address.
– Click the “validate” button
For version 3 (which you can get from “My Downloads” – but it’s in beta as the updated docs haven’t been released yet):
– Go to the main Microthemer page and then click the green “UNLOCK” button
– Enter your PayPal email address.
– Click the “validate” button
Please let me know if you need further assistance.