I have photoshop cs5 for some years. Recently I bought Canon 5d mark4. The photoshop cs5 can no longer open the Raw file taken by the new camera. What should I do?
Step 1 - see if there is a RAW update that is compatible with your very old program
-Updates start here and select product, read to see if you need to install updates in number order, or if the updates are cumulative for the individual product http://www.adobe.com/downloads/updates/
If step 2 does now show a RAW update that will work with your very old program, you have 3 choices
1-find a converter
2-buy Photoshop Elements
3-subscribe to the special photography Cloud plan
You would need Adobe Camera Raw 9.7 and CS5 only goes to 6.7.
So you will need DNG Converter 9.7 Adobe Digital Negative Converter 9.x
Set the Compatibility Preferences as shown in the above link to 6.6 and later before converting the Canon Raws to DNG format.