This would be achieved using a specific tag for the version of deluge you want to use, unfortunately i dont have tags that go that far back so for now i can only offer you deluge 1.3.12, im assuming then they only support deluge 1.3.11 or earlier?
Correct, they list 1.3.1, 1.3.5, 1.3.6, and 1.3.11 as supported, but not 1.3.12