I found a workaround. Though it takes some effort, it could save repeated clicks:

1. When viewing an album that is not in blog layout, click the Browse button on top right (near the prev and next buttons).
2. When you see the square thumbnails of all the images, select all the thumbnails by dragging (as though you're selecting text).
3. Right-click > DownThemAll selection.
4. On the "Pictures and Media" tab, select all the images (from the album).
5. Right-click > "Check selected items" if they aren't checked already.
6. Click "Add Paused". (Don't click Start because you don't want to download these.)
7. In the main DownThemAll window, select all the paused downloads you just added.
8. Right-click > Advanced > "Export selected to file".
9. Choose file type as "Text files" and save to a file. (You can save as Metalink or HTML as well, the procedure is still the same.)
10. Remove all the paused downloads that you just exported.
11. Open the text (or Metalink/HTML) file in Notepad.
12. Find and replace all instances of "s.jpg" with ".jpg" (no quotes!). Save the changes.
13. For text/metalink: Right-click anywhere in DownThemAll > Advanced > Import from file. You know what to do from there.
14. For HTML: Open the file in Firefox and download all the links with DownThemAll as you normally do. (Avoid the link at the end that goes to DownThemAll homepage though.)