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.

• Make sure adobe reader dc application is closed
• Click start type in regedit and launch the regedit aplication
• Browse to [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown]
• Right click > New > dword 32bit
• name it bUpdater
• set base as hexadecimal and value data set to 0 (the number zero) as below
• close down regedit

check the below

https://computergarage.org/disable-auto-update-adobe-reader-dc.html