The only additional prerequisite for Windows is Python 2.7. Before attempting the installation, run this command:

python --version

If you see Python 2.7.xx (where xx is the patch version and can be any number), you're ready to install the EMSDK. If you get an error saying the Python command wasn't found, or you see Python 3.x.xx and Python 2.7 isn't installed on your system, run this command to install Python 2.7:

choco install python2 -y

If you saw Python 3.x.xx prior to installing Python 2.7, you should be able to change the current Python version by updating your path. Before attempting the EMSDK installation, run this command to set Python to 2.7:

SET PATH=C:Python27python.exe