Let me explain.
Toolset was never "Theme Oriented" in the sense of entering the Theme Market or producing Themes.
The focus of Toolset is the Plugins with which you can add functionality to any theme.
The solution that Toolset provides is not a Theme, but a set of Plugins, which allow you to massively customize the WordPress install and the Front End.
Now, this Theme (Toolset Starter) was a good theme for showing how to use Toolset Layouts, mainly.
It integrated with it out of the Box, back in time when you still needed to manually integrate Toolset Layouts.
Nowadays it is still possible to integrate Toolset Layouts in a Theme so to design the entire Template, but it is not the recommended way.
Instead, usually, you want your Theme to deliver the outside design like header, footer and sidebars, and then style the content with a Page Builder or similar (like Toolset Layouts).
Toolset Layouts nowadays features all these things out of the box in any theme that uses the_content().
The Toolset Starter theme, for example, does not work with this new feature!
Further development is done in Gutenberg, both on side of WordPress for the core code, and our end to adapt for the coming features, made this theme as well obsolete and not usable anymore, as it is designed and intended for one only purpose:
- you have to use Toolset Plugins with it, and the best results are with Toolset Layouts.
It is an starter theme and not subject to continued development, but used to start an own theme, which can be built with/on top of it.
If you require a copy of it I can send it, but it's the same version as was downloadable until now.
The theme will not receive any development - this is why I recommend to evaluate if you need future features like Gutenberg and Toolset Content Layouts, or not.
If not you should be able to proceed with the current theme, but keep in mind that it will not receive active development.
The Theme I shared, is my own theme.
It is so simple, it can almost not break.
The Code is very well documented, allowing you to programmatically integrate any theme if you want.
But the final recommendation is to stick with a well supported and active Theme, from a Theme house, not a Plugin House.
I shared the recommended themes earlier.
Any theme will work, but those have specific forms of integration.
I hope I could be of any help.