Note that Kuorinka Plus Plugin works only in WordPress 4.3+ version.
For example Logo upload in Kuorinka Plus Plugin have big update and it’s using WordPress Core image upload system now. You might have to set your logo again in the Customizer under Kuorinka Plus Settings >> Logo. You can skip logo image cropping if you want.
Also if you don’t see your site title, set logo again and then remove again it if you don’t need it. Sorry if you have these troubles.
While Kuorinka theme is not using Hybrid Core (HC) it is using the parts of it. In Hybrid Core version 3.0.0 theme layouts was build again from ground up and they are awesome. Theme layouts now uses cool image radio control. This is just on great improvement in Hybrid Core version 3.0.0.
If you’re interested learning WordPress development I highly recommend that you join Theme Hybrid community.
You can now have accessible multi-level dropdown menu if you’re using Kuorinka Plus Plugin. In the Customizer locate Kuorinka Plus Settings >> Navigation Settings. From there you can enable multi-level dropdown. For long menus and lot’s of sub menus this is very useful.
Here is a full change log for Kuorinka theme:
Version 1.4.1 – September 21, 2015
Version 1.4.0 – September 21, 2015
And full change log for Kuorika Plus Plugin:
Version 1.1.0 – September 21, 2015