Not downloading apps

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May 7, 2016 7:32:22 PM via Website

I have taken this 2011 tab to Samsung & they said as its old system I cannot download apps or updates as they are no longer compatable. If I try to purchase app in "market" is says : Error while retrieving information from server [DF-RPC-01. Download app from Internet it says : There is a problem parsing the package. If from playstore it says: Authentication is required. You need to sign in to your account. ( I am signed in). I'm not very tech minded but I can't believe Samsung just don't update it to work properly or is that the way it is . Many thanks.