As you need to upgrade the Adobe Reader version from XI to DC, you can simply uninstall the Xi version from your system.
Use cleaner tool Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs to remove the application.
Then reboot your machine and then install the latest version of the Adobe Acrobat Reader DC from here Adobe - Adobe Acrobat Reader DC Distribution
Once the application is installed, launch the application and go to Help menu and Select check for updates.
It will install the latest patch released for this version.
You may refer this help document Release Notes | Adobe Acrobat, Reader for more information on latest updates.
Let us know if you need any help.
I have a question. If I replace Adobe Reader XI Version 11.0.23 with Adobe Acrobat Reader DC Version 2018.011.20038 will I lose any features that the Adobe Reader XI has?
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