I have a fully paid and registered CS6 suite. Following some drive errors I was getting the warning above. As of today I cannot open any PDF file, I get the nasty error window. Please help, I am writing program notes for a non-profit orchestra.
do you have a current cc subscription or did you have one before that message started to appear?
if not (ie, you've never had a cc subscription on the cs6 computer), reinstall your cs6 over your current installation, or if given the option when starting the install, repair your current cs6 installation.