To see the available Parallels RAS downloads, including installation files and documentation:
On the Dashboard, click the Active Subscription row inside the Parallels Remote Application Server product card.
Click Download at the top of the page.
This will open the Download page from where you can download additional Parallels RAS software and documentation. The version selector at the top (a drop-down menu) allows you to select a Parallels RAS version for which you would like to see the available downloads.
Note that you can also open the Download page by clicking Support on the page header (the red area), then clicking the Parallels Remote Application Server card, and then clicking Downloads & Documentation.