The solution to disable the autoupdate on my previous post, didn’t seem to work in the new Flash version.
So I found another solution. Just remove the update task after installation with the schtask command. I’ve used Installshield to perform this action.
First, Make a new mst. Add all you regular stuff. After that, make a custom action.
Choose New Exe, path referencing a directory.
Fill in as the screenshot above. Save the MST.
This works with both the ActiveX as the plugin version of the installer.
Update: Still works on Flash 11.6.602.171
And if you like copy paste (less errors) you can use
[SystemFolder]Schtasks.exe /Delete /TN “Adobe Flash Player Updater” /f