In v6.1 you now use the installation manager to update WID to the various fixpacks.
I had a very old install of v6.1 GM in a VM that I started up and couldn’t seem to update. I was getting the message “No updates found.”. Then I realized that the VM’s network card was set to ‘Host Only’, a private network.
Then I attempted to update but got an error dialog complaining about something to do with the installation manager. I closed the install manager and restarted. Sure enough, there was an update for it. I installed the update and now have installed v6.1.2.