Hi I recently had a problem opening CR2 files in PHotoshop cs4. I had to reinstall into a new computer, so obviously it installed the basic programme and not the updates. After trying everything, even calling the help desk, there was apparently nothing that can be donw as they no longer support cs4. I kept trying and found a you tube video, which i cant find again to add the link but i followed the link and with what I did earlier I can now open CR2 files in my photoshop cs4 I found the relevany update that I needed to install and downloaded it, camera raw 5.2 ( Adobe - Adobe Camera Raw and DNG Converter : For Windows : Camera Raw 5.2 update ) this is the one for the Canon 5d Mk2 After downloading it would not update the progeramme so I was in the same possition, but i noticed the files were there and i just needed to put them in the right place in photoshop so carried on looking for were to put the Plus In. This led me to the video. To the point. Download the update and save to a location where you will remember. open Adobe photoshop and go to "edit" Them " Preferences " then "General " Then " Plus-Ins" At the top you will see " Add Plug-Ins Folder " Check this box then navigate to the "win64" ( this is because mine is a windows 64 bit computer and the download is specific ) and Choose it. Shut down photo shop and try to open a raw. Bridge doesnt work for some reason but im going to keep looking. Hope this works for you as well.
... View more