Go to Edit > Preferences (Windows) or Acrobat /Adobe Reader > Preferences
In the left pane, select Updater
You now have four options Automatically install updates : The application will automatically check for downloads and automatically install if any are found Automatically download updates, but let me choose when to install them: The application will automatically download updates and will prompt you to install them Notify me, but let me choose when to download and install updates: The application will notify you when an update is available. Do not download or install updates automatically: Never check or download updates
Select the last option Do not download or install updates automatically
You can set a registry entry which will disable updates. This can be very handy if you wish to apply this setting to many machines via group policy / logon scripts. To apply via the registry do the following.
Sometimes when you disable auto updates via the app or registry the setting can change back to auto update (If you reset / recreate your windows profile or log on to the machine with a different logon)
By disabling the windows task scheduler the automatic check for updates will not work. To disable do the following
Click on start and type in task scheduler and launch the application
Right click on Adobe Acrobat Update Task at select Disable.