Why are CR3 files now not working, when they have in the past?

I’ve edited CR3 files in my lightroom classic (version 14.5.2) in the past, but now when I try importing them in, it says “Preview Unavailable For This File” and then when I hit import it says “the files seem to be unsupported or damaged”. The files are not damaged, they are working perfectly in my other programs. I also tried other files from a different SD card and got the same results, but I can see other CR3 files that I had already edited and imported in September (that were taken on the same SD card that I’m using just in the past). I can’t update my Lightroom Classic since my iMac is on Ventura 13.7.8. Why could I edit CR3 files in the past, but not anymore? What can I do to fix this? This is so frustrating that it’s worked in the past, but not anymore.