If you receive the following error when trying to authorize/license your OptimizePress 3 site:
The requested URL was not found on this server.
This error is typically caused by an incorrect Permalink structure on your site
How to fix this issue
1. Go to Settings > Permalinks on your left side WordPress menu
2. We recommend setting the permalinks structure to /%postname%/ – please note that if you have an existing site or blog setup and you change this, it could affect your page URLS so please contact us in that situation (or temporarily change it just to license your site then change it back)
3. Retry authorizing your site. This time the authorization should work
If you require any further assistance with this issue, please do let our team know