johannes18 Hello
Unfortunately, legacy products like Shape5, Joomlabamboo, DTHDevelopment are no longer maintained and will not receive Joomla 6 updates
We shared the update plan for Joomla 6 in details here: https://www.joomlart.com/blog/news-updates/joomla-6-upgrade-plan-what-to-expect
If you love the design of any template and would like to have it in Joomla 6, you can hire our custom services team to upgrade for you.
Regards,
Heinz