How to enable auto-update for your theme ?
Since WordPress 5.5 and the introduction of opt-in auto-updates for plugins and themes, you can enable auto-update for your themes purchased on presscustomizr.com. The auto-update mode can be set as soon as the theme has a new version available in your WP admin.
1 - In your WordPress admin navigate to appearance > themes page,
2 - when you see that your theme has a new version available, don't click on update but click on the theme it-self,
3 - this will open a popup on which you'll notice a link "Enable auto-updates" that you'll need to click