Coinciding with the start of the Microsoft Teams preview, the Microsoft Teams app for Windows desktop is now available to download. In fact, as shown on the download page, a version of the app is available for nearly every platform, including Windows 10 Mobile
As a reminder, access to Microsoft Teams is included in all Office 365 Business and Enterprise suites. If your organization happens to use Office 365 and has opted to take part in the current preview, you should be able to log into the app with your work email and start checking things out. The Microsoft Teams preview is currently available in 181 countries and 18 languages.
If you're interested, you can grab the desktop app from the Microsoft Teams website now. The app simply requires Windows 7 or later in order to work.