About a year ago, the first version of the Whonix Installer for Windows was made available to the public. Since then, there has been a continuous effort to find ways to make the process simpler, more reliable and less taxing for computers with little disk space. This effort now culminates in the release of a new Installer, build from the ground up with these things in mind. Based on InnoSetup instead of NSIS, it is far better suited to the task of handling the large files Whonix requires.
Additionally, the compilation process has been turned into a one step process, so anyone may create his or her own binary.
The new version may be downloaded from here: https://www.whonix.org/wiki/windows
Note that it is not required to reinstall Whonix with the new installer, if you’ve used the previous one. However, please remember to continuously update both Whonix and VirtualBox.