How to configure solar winds patch manager 2.1.5 server to automatically synchronize and download new updates???
You can follow the steps in this article to automatically synchronize new updates:
Configure synchronization settings and populate catalogs - SolarWinds Worldwide, LLC. Help and Support
There is a mechanism for automatically downloading them as well, but you generally want to be cautious with that. If you have anything that will approve the updates automatically or workstations that would download them automatically you tend to get more updates than you bargained for.