Well first the upgrade instructions are not incorrect. When there was a 4.8.5 download there was an upgrade482.php file and upgrades directory. When 4.8.6 came out the upgrades where moved into one file upgrade.php and this is in the 4.8.6 annoucements as well as the upgrade.txt was updated
Your looking at a new Photopost and an old upgrade doc.
Here is the upgrade doc I see when I open the latest version
Code:
Content visible to verified customers only.
The inc_features.php pulls photos from categories. It displays a random or latest etc image and then places the category name number of photos and comments underneath the photo. This is the way it was coded by the developer and as such since it displays category totals etc it does not work with members galleries.
As always with any of our code you may modify it to suit your needs