Correct Installation Destination of Add On Aircraft?

A number of freeware aircraft have become available.
What is the correct procedure for installing them?
(Unzip after download, place in Community folder??)
I have followed their instructions without success.

I just installed my first 3 aircraft today from the freeware section of In all 3 Cases, I just extracted or dragged and dropped the Folders in the zip or .rar directly into the Community folder.