Adobe does not always make the offline link obvious on their front page. To find the legitimate installer, you need to visit their FTP site or the enterprise download page.
While the world moves to the cloud, the need for offline installers remains strong for IT professionals and security-conscious users. By using the Enterprise/FTP download page, you can grab the full package, put it on a USB drive, and install Adobe Reader whenever and wherever you need it—no internet required. adobe reader offline
Since this machine may be offline, or you may want to control updates manually, you might want to disable the automatic updater. Adobe does not always make the offline link
: High-fidelity viewing of complex architectural or technical drawings. you can grab the full package