There are a lot of different Canon models with Mark II in their name. Which one do you have, and what version of PS and camera raw do you have?
I have a 7D Mkll, CR8.5 PSE12.
When I check for updates, it tells me Im up to date.
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The 7D2 requires ACR 8.7 and that’s not compatible with PSE12. PSE13 was out by the time the camera was released, so you’d need at least that new of version to process raw photos from a 7D2. PSE14 just came out so and upgrade to that would be the easiest thing to do. An alternative is to download and install the newest DNG Converter, and run it each time to convert your CR2 files to DNGs and those DNGs will open in old Adobe products.
The DNG Converter can be found, here:
PSE14 can be found, here: