The second good news is that, from now on, anyone can produce a build of the latest development version. Just download and run the fully automated builder here: https://github.com/slowphil/texmacs-win-builder/releases
But note that each time such builder is run, all the network traffic and computing involved requires a significant amount of energy. So please be responsible and use it only with valid reasons (i.e. wanting to hack the c++ code, or desperately needing a recently committed fix). In all other cases do not gratuitously waste this energy; it is more sensible and much faster to download the pre-built package.