In case the "Envato Market" plugin shows the theme but only gives you the option to install it, instead of updating, you can try the following:
- Update manually by switching to a different theme, deleting "UX Shop" and re-installing it from the zip file.
(Remember to download the zip file containing only the theme , and not the complete package).
This will have the same results as automatically updating the theme.
- You can edit the style.css file in the theme's directory and change the author from :
Afterwards the Envato Market plugin should give you the option to update.
If you are having trouble with this procedure, please open a support ticket.