This information is based on the original version of the program and is outdated; but should still be able to serve effectively as a general guide.
Quick Info on using the Album Art Aggregator:
(Remember, it requires the .NET Runtime to function.)
First, click the browse button and select your music folder:
Make sure that you've selected the folder which contains all your albums, you don't need to select each album individually:
Second, select the file structure of your albums.
(If you don't have one of the directory structures listed you're out of luck until I add more :-/ )
Third, simply click the "Get Albums..." button and it will generate a tree view of artists and albums.
Fourth, Select the album you want and double-click on it. The large box to the right will display "Artist - Album" and any current cover art with the filename "cover.jpg." Up to three album covers found for the displayed artist and album will be presented.
Finally, just double-click on the correct album cover, or whichever one you prefer, and it will save it to your album directory with the filename "cover.jpg"
And you're done! The cover you selected will be displayed in the large box, indicating it is saved.
Repeat for all your albums, and notice that albums which currently have covers are are highlighted blue for your convenience.