License utilized

Hi there!

I have bought the pro version of FooGallery and now wanted to install it on my new site (it’s actually the same site and adress, just a new theme and site structure), but I get the message:

“The license was already utilized. If you are trying to move a license from another site, open the Account page under the plugin settings in the admin dashboard, click on deactivate license first, and then try again.”

The problem is, that when I try to open the Plugin Settings, I’m met with a “Sorry, you are not allowed to access this page”. How can I solve that?

Thanks in advance.