Since this is an outdated version, it is best practice to disconnect your computer from the internet while installing to prevent the software from attempting to "phone home" for updates that no longer exist.
If you have an old USB drive, software backup disk, or a folder of old installers, that is often the safest way to retrieve the file without navigating sketchy third-party websites.
The (XI) is a standalone setup file that allows you to install the legacy PDF viewer without an active internet connection. While Adobe has transitioned to the subscription-based Acrobat Reader DC, many users still prefer version 11 for its streamlined interface, lack of cloud-service pressure, and compatibility with older operating systems. Key Benefits of the Offline Installer
Unlike the standard "stub" installer (approx. 2MB) that downloads components during installation, the full offline installer (approx. 40-50MB for Reader) contains all necessary files.
Since Adobe has removed version 11 from their main download page, you cannot simply "download" it from the homepage. You have two options:
