Thanks for the reply Mark. I read a lot of your comments here.
Actually, I was going for th HD version for Scopebox, but a guy at Scopebox told me a needed 4K. Bummer. I even bought a US$500,00 Epiphan av.io, to find out it didn't work with scopebox's new version. That's kind of fine (kind of!), not here to criticize anyone, and they make a hell of a good product. Mike from Scopebox was very supportive afterwards, and even told me about the possibility of using HD.
The ultra studio mini line is restricted to Thunderbolt 3, and it does not work with converters to TB 2 due to powering, I think. So it appears I am stuck with the Decklink. Best to use Hd version for less horsepower, that's good news - should work then, right?
But the other question remains: will mini recorder (HD) inside an enclosure with Thunderbolt 2 connect to my thunderbolt 2 only Macbook Pro? It appears to be a silly question, but I don't want to spend another dollar on wrong equipment. By the way, if anyone needs an epiphan 4k av.io, I'm selling cheap.