Hi Jonathan: there is a list of HTML and PDF files for download here: http://blogs.adobe.com/premiereprotraining/2010/08/help-documents-for-creative-suite-5-pdf -and-html.html
The help config files are located in the directories indicated below -- however, you did mention that editing those files is not feasible. So, I'm not sure if this the right solution for you ... We are resolving this in the next CS release, however, I understand that this is not much of a consolation/solution for you right now.
Tip: To find this directory in Windows, copy the preceding phrase into the Windows Explorer file manager.
Mac OS: /[username]/Library/Preferences/chc.4875E02D9FB21EE389F73B8D1702B320485DF8CE.1
Thanks for your help.
Are you saying that CS5 won't have an update but CS6 would?
I've since used ProcessMonitor from Microsoft to see what your apps are doing - it looks in that directory then it looks under C:\program files\common files\adobe\help
So what I've done is downloaded the client zip files eg http://help.adobe.com/en_US/flash/cs/using/client.Flash_CS5_Using_en-us.zip and extracted and put in the right directory - now help loads up.
But I can't find the zips to Media Encoder and Bridge - please could you link me to them?
Also another issue - is there a way to set the cache size in Bridge via regedit or file?