Extract the zip package somewhere (be sure that you have write access - don't extract it in “Program Files”). Run the executable found in the bin/ folder.
Follow the instructions given when you run the installer executable.
To run Minetest, click the icon in the start menu, or the desktop. Alternatively go to C:/Minetest/bin and run the executable.
Note that the installer installs the same version as in the .zip (be sure that you have write access - don't install it to “Program Files”).
These builds are made by community members and more recent than the official builds, containing new features (may cost stability).
If you have packaged Minetest for another distribution contact us so that we can link it.
There is a FreeBSD port.