I tried installing a template (BabyCare) and got a message:
Environment Setup Incomplete
It looks like you are trying to run Joomla! from our git repository. To do so requires you complete a couple of extra steps first.
More Details goes to here: https://docs.joomla.org/J4.x:Setting_Up_Your_Local_Environment
It states there: With Joomla! 4 we have changed the development process. It is no longer possible to clone the repository and have a usable Joomla installation. We follow best practices and implement a build process for the CMS.