canon 5d mk iv cr2

See that faq:

FAQ: Will Photoshop Elements work with my camera, or Why won't my raw files open?

And the ACR version module required is 9.7

Cameras supported by Camera Raw

PSE15 can be updated to 9.10, but read the note for dual pixels:

Working with Canon Dual Pixel raw CR2 files in Camera Raw and Lightroom

nunmill  wrote Will elements 15 be able to open the canon cr2 files in their new format and the dual pixel file?

I very much doubt that dual pixels editing will appear in the present version, and Adobe does not give such information in advance.