I believe Willam's instructions are more about downgrading a whole version rather than a patch.
The way to drop back to a previous patch is to uninstall and reinstall again. Then avoid use the Update menu option and go to Adobe - Support : RoboHelp Support Center : Service Releases where you can choose the highest patch you want. The problem in your case is you also want to specify a build version and that is not an option. I believe that was because the earlier build had an issue so really nobody should be on it.
I have to say that I disagree with your manager although I do understand her caution. Given what you want cannot be achieved, I would approach the whole thing in a different way, especially as the whole point of the patches is to fix known issues. I would go to each machine that has a project and create a zipped copy of each project. I would then put a copy of the zips on one machine and upgrade that to the very latest patch. Unzip each project, upgrade it and test.
I think the only issue seen in upgrading to a later patch was later found to be because of something unique to the workflow or the environment. My expectation is that no problems will be encountered. You have the fallback that if they are, then you have the original projects and zipped copies on the original machines so nothing lost.
My take is you are running more risk of hitting issues by not upgrading but of course I cannot give you any guarantee.
See www.grainge.org for RoboHelp and Authoring information
I believe we mailed about this issue as well. The easiest way to downgrade a patch is to put the minorversion to 0. If you get an upgrade message, simply upgrade the message.
It seems that I misunderstood the issue. If it is about the RoboHelp version installed, the only way I can think of is what Peter indicates: uninstall and reinstall RoboHelp. Just avoid installing the patches.
Though the patches contain several enhancements for the output that you may want to include though.
No don't avoid the patches, rather only install what you want from the link
I gave. Don't use the menu option as I think that will just apply 4 as it
contains all the others.