By default, Adobe Acrobat Reader DC is set to automatically download and install updates, and the ability to disable or configure automatic updates has been removed. But you can still configure/disable this through the registry in the following key:

Windows x86 (32-bit): HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe ARM\Legacy\product name\product version

Windows x64 (64-bit): HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Adobe\Adobe ARM\Legacy\product name\product version

Replace product name and product version accordingly. For example: Reader\{AC76BA86-7AD7-1043-7B44-AC0F074E4100}

Under the key, set the Mode DWORD value to one of the following:

0: Do not download or install updates automaticall  ...