[Boris The Spider]

If the author put them in the zip folder from their Paintschemes folder and checked "Use full filepaths" you should see to the far right (expand the Winzip window sideways) that info, i.e.
C:\Program Files\Ubisoft\IL-2 Sturmovik 1946\PaintSchemes\Skins\Bf-109E-4 for example.
If you can't see that they uploaded them either without "full filepaths" checked or from some other place, in which case a manual install (drag-n-drop or Copy/Paste) is the only solution.