Hey Steve,
This is a good question. We should've written sometting a bit easier to understand. What this change means is that if the only folder you're targeting (in wyBuild) is the "Your program's folder" then wyUpdate will dynamically check if the user has permission to update that folder.
Let's say you have a limited user and you want them to be able to update a folder on, say, "C:\YourApp". Prior to wyUpdate 2.6.18, it would just say "You're a limited user, this folder is outside Desktop/AppData/etc, thus elevation to an admin is needed.".
Now, with wyUpdate 2.6.18, wyUpdate sees if you modified the ACLs of the folder to allow the limited user Read/Write/Delete/etc. access to the folder. And if you have, then the limited user can update without requiring elevation.
Does that make sense?