Acrobat - How to disable sign-in pop-up window

Hello, 

recently, we´ve installed latest version of  Adobe Creative Cloud, we have SDL (Shared Device Licence) for higher education, and we would like to disable sign-in prompt window, because most of our student are using only functions of Adobe Reader and thus they don´t need to sign-in full version of Acrobat Pro. We looked up for solution at your forums (tried 64-bit Unified App Installer, registry changes - describe in this arcticle https://www.adobe.com/devnet-docs/acrobatetk/tools/DesktopDeployment/singleinstaller.html), but so far no success.