At the Worldwide Developers Conference (WWDC) in 2017, Apple announced that macOS High Sierra will be the last release to support 32-bit apps without compromise. Support will be dropped with the release of macOS 10.15.
Acrobat core code base was migrated to 64-bit with the Acrobat DC release in 2015. In the August 2019 release of Acrobat DC, all the shared components were also migrated to 64-bit for all the Acrobat tracks – DC, Classic 2017, and Classic 2015. Acrobat is fully compatible with 64-bit macOS.
*Following activation mechanisms will not be supported in Acrobat 2015 on macOS: