You need the standaloneinstaller for Adobe Reader XI.
You can download it here: http://get.adobe.com/de/reader/enterprise/

1. Download the standaloneinstaller for Adobe Reader XI
   and put it to the CLIENT_DATA-directory on your Workbench.
   
2. Create new textfiles in the CLIENT_DATA-directory and fill them up with the scripts provided down there.
   You might want to edit some lines in order to fit your needs.
   
3. Ready the package and install it on your server.

[Actions]
;Text shown during installation
Message "Installiert Adobe Reader XI"
;Sets the LogLevel
;Allowed LogLevels are:
;0 = nothing (absolute nothing)
;1 = essential ("essential information")
;2 = critical (unexpected errors that my cause a program abort)
;3 = error (Errors that don't will abort the running program)
;4 = warning (you should have a look at this)
;5 = notice (Important statements to the program flow)
;6 = info (Additional Infos)
;7 = debug (important debug messages)
;8 = debug2 (a lot more debug informations and data)
;9 = confidential (passwords and other security relevant data)
SetLogLevel=6
Files_Copy_AdobeInstall
WinBatch_Install
Registry_HKLM
WinBatch_CleanUp
 
[Files_Copy_AdobeInstall]
copy "%scriptpath%\*.*" "c:\adobeinstall\"
 
[WinBatch_Install]
c:\adobeinstall\AdobeReader.exe /sAll /msi /norestart ALLUSERS=1 EULA_ACCEPT=YES
 
[Registry_HKLM]
;Disables Adobe Reader Updates]
OpenKey [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\11.0\FeatureLockDown]
Set "bUpdater"=reg_dword:0x00000000
 
[WinBatch_CleanUp]
;Should delete the folder copied to the harddrive, but doesnt work properly for some reason.
rmdir c:\adobeinstall\ /S /Q   

[Actions]
Message "Deinstalliere Adobe Reader XI"
WinBatch_uninstall
 
[WinBatch_uninstall]
MsiExec.exe /passive /x {AC76BA86-7AD7-1031-7B44-AB0000000001}