We make all efforts to ensure our themes are compatible with the latest stable release of WordPress, and no major issues have been reported since the last update. Our theme licenses allow for website developers to create websites for clients using our themes, however this does not automatically make their clients, AppThemes customers. It's not clear if you have purchased a site from them or if you have purchased the theme and they have developed it from there? If you have paid specifically for the theme and the account is in your name then we could search our records based on your payment information if you could please
email us with further details. Otherwise, if you have simply hired a developer to create the site for you using their own license, then yes you would need to purchase your own theme license in order to gain access to theme updates and support. you can find more information on our
pricing page.
The license purchase will not effect your existing installation unless you actually upload the theme and replace the existing theme (which would in turn overwrite your customizations). Thanks.