License Key problem, I guess

Hello,

few month back our company bought Ultimate Auction Pro licence for one of our client. We started testing and build website in testing URL page https://aukce-obrazy.cz.webar.cz After some features and edits that we made, project is finished. So we moved to live URL https://aukce-obrazy.cz but after 2 days of using, plugin system crashed. Auction plugin is active but not showing in backend of wordpress. Is it possible, that problem is in our license key, that we used for testing page and now is already expired ?

Please let me now asap.

Thank you for help.

https://www.ads-software.com/plugins/ultimate-auction/