Hello Adrian,
Hubgets Desktop is available for Apple OS X and Microsoft Windows x86 and x64. Hubgets does have a Windows client and you can download it here:
https://www.hubgets.com/download/
Even if the app is not installed on a new colleague's device, he/she will still be able to immediatly contribute to your work by accessing Hubgets in the browser. We wrote a blog article on the topic of how people are more comfortable using Hubgets desktop clients or Hubgets in the browser: https://www.hubgets.com/blog/browser-vs-desktop-app-win-win-with-hubgets/