The template is not ready for latest Joomla kindly install it on Joomla 3.7.
You can share the error details here so i can share them with the development team and they will check it during template update.
We are updating the template on Popularity and priority basis.
I am unable to give you a fixed time for this, kindly give me your site details where the issue is present in private reply. so I can share it with and they will check it during the update.