Why am I not seeing updates in Denali theme?

New Theme releases can be downloaded from your UD Account

At the moment already available Denali 4.*.*

You will need to update theme manually(Download from UD Account and upload to your site). There is a slight change in a method, that is the reason why notifications about new releases of themes will be only available after you will have Denali 4.*.*, so after you will update your theme manually(you will need to do this only once), you will start seeing notifications about new releases again.