It looks like you are new here so first of all welcome to Scripter's Rift! We do things a bit different here than the providers you might be used to and since it's your first time downloading RiftSync, we wanted to give you a rundown of how things work.

Launch the instance of RiftSync you just downloaded, you will see that the status bar on this page will change to indicate the progress.
As you can tell from the unique color of the logo, each file you download is uniquely generated for you and bound to your account, so make sure you don't share it! To ensure your security, each instance will expire after 30 minutes.
Once the startup phase is complete the file will delete itself. You can proceed to pick the game you wish from the page and simply launch your game and enjoy.
If you encounter an error you will see a popup on this page, our support team is ready to help you through any issues you may have.