I got to try it a while back and same problem, it uses very recent versions of C++ which my distro didn't support. I finally got the AppImage, but I had a few breaking bugs, making it too unreliable for actual work. But I also noticed that the project is quite active, so maybe most of the issues are fixed now. Maybe I should give it a try.

For now, my hex editor of choice is 010editor. Not free software, but the best for my application. Like ImHex, it supports huge files and block devices, and it has a powerful definition language.