My Recorded Videos Previews are Broken on PC not on GoPro

Had a similar problem. Bought my first GoPro, the Hero 11 Black. Many years old Windows 10 PC. Couldn't see the videos on my computer, but my iPhone had no problem. Had to buy a software patch at the Microsoft store for $0.99, and that solved the problem of being able to see it on the old PC. Next, Hero 11 Black only shoots in H265. Period. Owners of older GoPros - the Hero 11 is not the same as the Hero 10! I have researched this. I also faced the problem of having older Adobe video software. It can't read H265! I found the free Handbrake program online to convert H265 to H264. The good news is, it works, and a lot of devices can't read H265 yet, anyway. I can now edit H264, 4K 60 FPS clips in Premiere Pro! The bad news is the extra step costs rendering time.
BTW, when I called and wrote to GoPro, each agent told me that the FPS on the Hero 11 is a true 30 or 60 FPS (like my iPhone). Not true, fortunately for me. GoPro Hero 11 shoots at 29.97 FPS, and 59.94 FPS respectively, which allows me to synch with my older HD cameras and camcorders.
My GoPro Hero 11 Black shoots awesome sharp and clear videos, for which I am finding some new and interesting uses.

Fortunately, my old PC does have GPU, so I am able to make that work.
Of course, there always is some loss during conversion. I use these settings in Handbrake: see screenshot. I set that up and made it into a preset.
These settings don't seem to affect the video, at least to my eyes. As far as sharpness goes, some can always be put back in during post-production. My computer seems happy with these settings, and I have had Pond5 approve all the clips I have sent in with these settings. While we all would like maximum quality, we also have to allow for the least common denominator in what a viewer has to view it with. I found that clips with these settings play well on my 3-yr old 55" TV, and hopefully on everyone else's.

I don't know about 5.3K. I haven't tried it yet. I may not, with my antiquated system. It is straining to work with 4K. My take is that while we are looking for the ultimate high-resolution images, we lose sight about the fact that the human eye can only discern so much. Also, how will our work be used? And, at what distance?
I imagine if I wanted to spend about $20.99 per month to get Premiere Pro CC, and bought the newest, latest, and greatest PC system out there, I could work with H265 videos without any problem and bypass Handbrake altogether. I am running the CS6 version of Premiere I bought (the last boxed version, circa 2013), and have no additional costs. If I was making a killing with my videos, that would be a no-brainer. But from a business and financial standpoint, it makes no sense to spend any more money than I have to, since it doesn't bring in that kind of money.
In short, my version of Premiere Pro is too old to run H265, even if my computer was more compatible. If you are running Premiere Pro CC, I would assume you could run H265 5.3K videos, if your computer was more capable.
Good luck.
Even with all the extra work I have to do to output edited videos, I am happy with my GoPro!