The light download page for old iMacs. Old iMacs run an old Safari that can't open the full Encore site. This page works in Safari 8, 9 and 10 too. On the iMac, type this address into Safari:
encore-ivory-omega.vercel.app/imac

Turn this iMac into
a second screen.

Download Encore Receiver here, on the iMac. Then open Encore on your Mac.

macOS 10.13 High Sierra or later

Download Encore Receiver

Intel iMac, Late 2009 to 2020. Updates itself.

OS X 10.10, 10.11 or 10.12

Download Encore Receiver Legacy

iMac from 2007 to Early 2009. Updates itself.

Which macOS does this iMac run? Open the Apple menu and choose About This Mac. The version is right under the name.

Then

  1. 1. Open the file and drag Encore Receiver to Applications.
  2. 2. Control-click Encore Receiver, choose Open, then Open. macOS asks once because Encore is not registered with Apple.
  3. 3. Open Encore on your Mac. Both screens show the same six digits: Allow on the iMac, Confirm on the Mac.

On your Mac instead? Encore needs macOS 14 or later: Download Encore.Install guide