Just don´t do it via the softwaremanager.
Go to your master repo, and first maybe get rid of the Patch 8 if needed.
Afterwards head over to McAfee download site, enter your NAI and there you can download all the older patches.
Then you go back to your repo and click on check in packages, select your update and then you should be fine to define a new client-task, policy or whatever you like to get this roled out.
Dan, thanks I didn't realise you could do it that way. I've done that now and have my PC's on patch 6 and will then hopefully go to patch 8.
You´re welcome mate.
Glad I could help.