Sorry forgot to mention two things.
External Port 50315-50316 but Port Range 50315-50316 should work without External but try botg with or without.
Last thing;
Important note to Xfinity users: You may have to turn off the xFi advanced security feature on your connection to prevent your downloads from aborting
Also check for any firewall on the computer, If so allow 50315 and 50316 TCP/UDP