ProRes struggles

I recently bought a CRT pack to use for some edits.

Trying to view the files in Photos nets the error 0xc00d5212.

The description of the payhip states "prores" so I assume the files are encoded in that format (they are .mov files, I don't know if that matters).

I downloaded what I think to be the codec from https://support.apple.com/kb/DL2033?locale=en_US. It still doesn't work and I'm not too sure why. VLC Media Player shows a single frame of the clips right around half way through. In after effects, they show nothing. 

I do apologise for the lack of information, if you need anymore just let me know. Hoping someone can help me with this.