Can't deregister Betheme

A customer have a Betheme Themeforest and I can`t upgrade to the last version. I don’t have the purchase code and username that was used when it was installed. My customer bought another license of Themeforest and I tried to deregister the old themeforest buy I can´t. I dont have the purchase code and username that was use to register the old themeforest. Is it possible to add new themeforest appereance if the old themeforest is still installed and not fderegister? What can be done in this case?

Regards

You can update the theme manually.

Hi,

Please contact the author of your purchased theme, the author will assist you.

How to contact an author to get support or for any technical query:

Thanks