If your license key is not activated on your website, you will see that the update is available but you won’t be able to update the plugin. You may receive an error message such as:
Update Failed: Download failed. Unauthorized
Check that your license is still valid and that it is associated to the correct website. You can do that in your account > License keys > Manage sites.
Note that if you activated the licence key on a development site and moved it later to the production site, our server is not informed of the move and thus, although the license key may appear to be valid in your dashboard, it is still activated on your development site. You can avoid this issue by deactivating the license key on the development site, and then activating it on the production site.