IGcapture is a freeware app to download and save Instagram pictures.
The program is straightforward to use. Just click on "Go to Post" on an Instagram photo and copy and paste the URL. Now, copy it into IGcapture and choose a name and the picture is saved.
Keyboard shortcuts are available. Options include paste and go when activated, save when downloaded, open when saved, minimize when saved, and add URL to image metadata. If for some reason you get stuck, help is also available, but odds are you won't need it.
If you want to save some Instagram photos, IGcapture makes it easy.