I see, yup. So there are probably more issues here than the pending modal upgrade which is now showing up.
The ‘official’ integration is end-of-life, and we (@team) don’t currently have any plans to bring it back.
That said, please do feel free to post in this topic to see if there are any other community members with interest in resurrecting the theme component.
If you have a budget, another option might be to post the project in Marketplace.