Adobe Reader DC x64 shares an unified installer with Acrobat DC x64, this is a major headache for enterprises. When you install Reader, its listed in program and features as Acrobat not reader, same with the shortcuts causing confusion for users as Reader is not listed, just Acrobat which then launches Reader.

To make matters worst, if then the user has an creative cloud subscription with creative cloud installed, it shows that Acrobat is already installed and gives you the option to upgrade to full Acrobat, this then downloads another installer (this is just silly, what's the point of unified installer if it needs another download to activate the full product?) and updates reader to acrobat which in turn breaks the detection method of the SCCM deployed adobe reader.

This is a complete headache to manage in an enterprise environment. All machines have reader deployed by default, we could exclude those that have creative cloud subscriptions from the reader deployment collections but not all our creative cloud subscribers have Acrobat but will need to explain they have to install Acrobat from creative cloud that's actually reader.

We also will need to explain to the users of Reader that the shortcut will be named acrobat but is actually reader.

These issues don't exist on the x86 versions.