It doesn’t happen that often… which is why this issue didn’t surface sooner. But in some cases, if you’re moving your site from one server to another — for example, if you’ve built a site on a staging server and then you’re copying the finished site to the live server — you won’t be able to activate your license on the new server.
The reason this happens is because ICS Calendar Pro stores an “instance” — a string of data, consisting of your server’s IP address plus a random string of characters — to identify individual uses of the license. (It’s our way of managing how many of your allowed installs you’re using.)
The thing is, if your IP address changes, the “instance” needs to be updated, or our license API server will think the instance is already in use. There was a way to fix this, but it involved multiple steps and treading into the dangerous “hidden” options page.
Now, you’ll find a convenient Regenerate Instance button right on the ICS Calendar → Settings page. Click it and you instantly get a new instance string.
Keep in mind that if you do this when your license is already successfully activated, the plugin will detect a configuration change and force you to re-enter your license. If you do this accidentally, you can easily retrieve your license key from the License Keys page under My Account.
This new feature is available today in ICS Calendar Pro version 4.4.10.
—Scott