Hello Jim Metcalfe,
I understand that you are not able to download the proper Sling player app for the Slingbox 500. However, that application is not needed for the Slingbox 500 model. Simply, go to our website www.newwatch.slingbox.com to use your Slingbox 500 away from home.The below link will direct you to the needed website.
Sling Moderation Team