You can find these on your Webex site still under 'downloads' from the 'Webex Training Center', or, I've attached them here if that helps.
This is known as the 'Universal Toolkit' or Webex Player. Please note that Microsoft deprecated the UCF format many years ago.
atrecply.msi.zip is the windows version
webexplayer_intel.dmg.zip is the mac
~Joe Tansey