IIRC Those are the scenarios that DoW sells as part of their Memoir '44 products.
The others are fan made scenarios (some of which are quite good, IMO), which you can download from their site, or from other sites, where people uploaded them.
Still not every Scenario ever made, but a large number of them, are available in fan created Books. The Books group them by Theater of Operation and in Chronological order. Well worth getting if you are a fan and probably more scenarioes than most of ues will ever find the time to play.
You may have to sign up to Boardgame Geek to download the files unless someone here has a link to an alternative archive:
Not sure what causes the error, but unfortunately I am getting this:"Error: This link has expired or is invalid. Please go back to the file page for a fresh link. " with every one of your links.
It is worth it so I recommend it but If you would rather not then that’s your prerogative.
You could also try searching the web with the file names, maybe another source will show up.
I was already signed up and logged in on BGG when I clicked those links, but they still gave an error message.
I am also well aware of the location of those files, having downloaded most of them already, but I thought that you might like to know that those links generated errors instead of directly pointing to those files that you so kindly tried to share.