CR3/adobe

After always using the standalone version of Lightroom (and PS) yesterday I purchased the web version/creative cloud. I have been given a thumb drive from the Photographer of my son‘s wedding with CR3 files. The folder of the edited photos will not open in Lightroom or PS The unedited photos open. He uses Photoshop, but they shouldn’t they open in either program? In PS I get error message of “File format module interface”. The error message in Lightroom is just an “!”. My PC meets the minimum requirements for LR, however, I am getting a larger hard drive installed today so I can properly download Photoshop. If I convert his edited photos to JPEG or Dng will I lose the edits? If I am using the most current Lightroom and or Photoshop, shouldn’t this file type open? I do not know his cameras used, but could ask if needed. He uses Mac and I have windows pc. He has given me full access to edit any of these photos. On my PC The file size of the unedited photos, is five digit KB. The file size in the edited photos is 4 K. Took flash drive back to him today. He put it in his computer and everything shows as five digit KB. Should I just go ahead and convert them?  This is so frustrating! Thanks for any help you can offer!