On their website, you run this command in an ADMINISTRATIVE command prompt (you know.. right click cmd and run as administrator):
@powershell -NoProfile -ExecutionPolicy unrestricted -Command "iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin
and then choco install maven. Now you may have to specify a version (choco install maven -version 3.2.5), if the mirror chocolatey attempts to use does not have the version chocolatey is trying to download.
Use with your favorite IDE!