I've checked I'm putting the addons into the correct community folder by checking the watched folder in developer mode.
I unzip the downloads from this site without changing any name or anything.
I move the unzipped folders to the community folder as shown in the image and restarted FS2020 and they just don't appear.
Downloads are 2 liveries for the mb339 and the Boeing Jet (US ver of Hawk)
And Old Park Farm scenery (with the other addons required)
Can someone advise how to remedy this please?