Searched and found this http://forums.adobe.com/message/3464880
Basically, need to download the offline installer from Adobe, open a command line and enter:
AdbeRdr1010_en_US.exe -nos_o"
(don't put a trailing \ at the end of the file path)
Don't hit cancel yet! Make a copy of the files in that location, then you can select cancel on the install - it will then automatically delete the folder it just created, with all the files in.