Run the Installer: Open the downloaded file and follow the on-screen prompts. The installer will replace any older 32-bit versions with the new architecture. System Requirements

Unless you are running a 15-year-old PC with 32-bit Windows, there is zero reason to stick with the old 32-bit Reader.

To run the latest 64-bit version as of April 2026, your system must meet these specifications from Adobe Help Center 64 bits or 32 bits - Adobe Community