We have experience of some users unable to update the theme to the version 1.6.0 due to a WP Envato Market plugin issue (see https://github.com/envato/wp-envato-market/issues/118 for more info).
The fix is on the way for the next Qibla version, until the release, kindly perform the following tasks:
1. Log into your ftp
2. Navigate to the wp-content/plugins/envato-market/js/
3. Download the attached zip file and unpack it on your desktop or other folder.
4. Upload the unpacked file updates.min.js into the current ftp directory.
If you still have issues on update the theme, please contact us and provide WordPress Admin login details and Ftp credentials, we'll have a closer look on that.
Thankyou for your patience.