Visit https://jamworks.com/ and click on 'Sign up'. All you need is your email address and your name to create an account. All other fields are optional.

Once you've completed the registration process, click on 'Download app' in the menu.

Then click the 'Download for Windows' button.

This will start downloading the application. Once it's finished downloading, click the file to start installing the software.

When prompted, select 'Yes' and wait the the install to finish.

You will now see the Jamworks icon on your desktop, and you'll be able to open the app and login using the details you used to register your account.