http://ardownload.adobe.com/pub/adobe/reader/win/11.x/11.0.01/en_US/AdbeRdr11001_en_US.exe
If you choose to deploy it, do so with open eyes. Secure your network, disable JavaScript, and never assume an old PDF is safe. For everyone else, migrate to SumatraPDF or bite the bullet and update your OS to run the modern, supported Adobe Reader DC. adobe reader xi 11.0 23 offline installer