There are a few ways to view someone’s old Instagram photos on a computer. One way is to use the “View Instagram Photos” option in the “Photos” section of the Instagram app. Another way is to use the “Instagram Photos Viewer” app. The third way is to use the “Instagram Photos Viewer for PC.” The fourth way is to use the “Instagram Photos Viewer for Mac.” The fifth way is to use the “Instagram Photos Viewer for iPhone.” The sixth way is to use the “Instagram Photos Viewer for Android.”