I got it to work. Problem was TLS 1.2 not enabled on my Windows 7 machine (yea, win7, long story). Here are the instructions to enable. And I think any 3.1.x composer works with any 3.1.x Director. Control4 claims so. I would upgrade as you suggested but I have the last Composer that runs on win7 ... again, longer story having to do with UTM and Apple M1 (sigh)