I have a Canon ESO 5Dsr Camera and I am trying to open my files into Lightroom (4) and Photoshop Version (CS5.1). The files are in CR2 format and will not open unless I use the DNG converter. Is there a plug-in I can enable to skip the DGN converter application? Or is there any way to open these files directly though Lightroom and Photoshop?
Every Canon camera has a unique version of CR2. They may be all called CR2, but they are all different in their metadata contents and arrangements. Most other camera makers do the same with their proprietary formats, which is why third party Raw converter makers have to constantly update their products.
You can't expect to open a CR2 from 2015 with software that hasn't been updated since 2013 (LR4 was last updated, IIRC, in June 2013.)
So you have two alternatives; continue to use the Dng Converter (2015 version) or upgrade to LR6.1 or LR CC-2015