If you see a licensing error on your site, you need to upgrade to the latest theme which has the fix. I was running version 1.08 and it wasn't authenticating properly.
Originally Posted by OptimizePress Support
If you need to license a new site in OptimizePress please follow these steps:
1. Go to the new members area Oops! This Content is Members Only – OptimizePress 1 Customer Hub and download the latest version of OP (1.61). You must use this new version. You will need to enter your original OptimizePress logins to get access
2. Upload and activate this new theme on your site (follow our tutorials if you’re not sure how to do this)
3. When asked for your license key, go to our new licensing area at Oops! This Content is Members Only – OptimizePress 1 Customer Hub and enter the URL of your new site including the http and any sub folder or subdomain if you are using those
4. Grab your license key (usually your email address) and paste it into the licensing box
Your site should now license. If you have any further issues please let us know.