If you are running Windows 10 (64-bit), you must use the 64-bit installer. Installing the 32-bit version on a 64-bit OS works, but you are leaving performance on the table.

Improved performance when handling large, image-heavy PDF files.

: Reliable mirrors like Softonic also host download links for various versions. Quick Installation Guide Download Acrobat 64-bit for Windows - Adobe Help Center

Sometimes aggressive firewalls block the installer from communicating with Adobe’s servers.

: The primary download page provides a small "online" installer that requires an active internet connection to complete the setup.

Adobe Acrobat Reader is a free software application that allows users to view, print, and annotate PDF (Portable Document Format) files. Developed by Adobe Systems, Acrobat Reader is the most popular PDF reader in the world, widely used by individuals, businesses, and organizations to access and share information in a secure and reliable manner.