This version does not officially support Windows 11 or Apple Silicon M1/M2/M3 Macs natively (though it may run via Rosetta 2 on older macOS versions).
Unless you are running a legacy Windows Server 2008 R2 environment that cannot support the newer Visual C++ runtimes required by Acrobat 2020+, you should move to the Continuous Track or at least the final Classic Track build (2019.021.20061). Adobe Acrobat Pro DC 2019.010.20100 Ml
For administrators, installing this version could be customized using the Adobe Customization Wizard DC , allowing for the "REMOVE PREVIOUS" installer property to be set to "YES" to properly remove older Acrobat XI versions. This version does not officially support Windows 11