Frustrating, right?
Note: The link above points to Adobe’s official Enterprise distribution page. This is the legitimate source for the full offline MSI/EXE packages. adobe reader standalone installer
For advanced users, Adobe maintains an FTP server where all versions are archived. Frustrating, right
Adobe now offers a Unified Installer for 64-bit Windows. This single package installs Reader by default but can "unlock" Acrobat Pro or Standard features if the user signs in with a licensed account. System Requirements (Latest Version) adobe reader standalone installer
Adobe updates Reader every few months. Sometimes a new version breaks your workflow. With the standalone installer, you can save a copy of a known working version for disaster recovery.