Unable to write to C:/Users/Public/Sony Online Entertainment/Installed Games/DC Universe Online/UNREAL3/DCGAME/COOKEDPC/MAPS/METROPOLIS/MMET101/MMET101-SHARED-6-4.UPK - http://dcuo.patch.daybreakgames.com...zs/c0/965/fe5893d6212d5199988c67f38a53bae4755. The file may be in use or you may lack the necessary permissions to install
If you are instaling in the US server switch it to EU server. Same apply if you are currently in the EU server installing. Happened to me and spent hours trying to fix it. Found a post on steam telling me to switch servers for the install. It worked