You are now running the 64-bit version. You can verify this by going to Help > About Adobe Acrobat Reader DC . In the copyright dialog, it will explicitly say "64-bit."
Warning: Always download Acrobat Reader from Adobe’s official site or Adobe-distributed offline packages to avoid tampered installers. You are now running the 64-bit version
Approximately 380–450 MB.
: Once installed, open the application and go to Help > About Adobe Acrobat Reader to confirm you are running the 64-bit version. You are now running the 64-bit version