Having download EU5 can’t download 4.26

I recently downloaded the magnificent EU5.0, which was my first foray into this unreal world. Loving it! However, I thought I’d download 4.26 so I could make use of the Marketplace items I wanted. It just won’t do it. Every time I click on download it says I need the Epic Games Launcher, which I already have, obviously. I tried reinstalling the Launcher, tried repair, but 4.26 just will not download to the Launcher. Any ideas? Thanks in advance.