Attempted to install Microsoft Office for Mac 2008 in El Capitan, notification on computer stated it was a blank disc.  Tried installing Office for Mac 2011 with the same results.  I have a Mac Pro late 2008 model.  Any advice out there?

Attempted to install Microsoft Office for Mac 2008 in El Capitan, notification on computer stated it was a blank disc.  Tried installing Office for Mac 2011 with the same results.  I have a Mac Pro late 2008 model.  Any advice...
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