Hello

you can download the current developer snap-shot at github. Just clone the master.

Cloning requires to work with Git. For an admin, who wants to start a fresh installation or update, it's much simpler to download the ZIP, that is offered on the linked page via the same green button "Clone or download".

By the way: I can confirm the ability to update from 2.3.7 (tested) and to make a fresh installation. Both ways are working with the current development code.

Attention: The update requires to store a new file on the server (config/VERSION) before one starts the update process!

The current available development version is the 2.3.99.1.

Tschö, Auge