first they were xx32
then they were xxui
now they're dead.
they really, really, really *and I can't stress enough really* should not be used.
the UI codebase has become a buggy, unstable, unmaintained mess, it will ruin your overall emulation experience in many ways, and simply lead to frustration when it fails, causes random crashes, corrupts your files, or god knows what else.
just use a regular build with the QMC2 frontend, that's as near to an official frontend as you're going to get these days and is the one actively recommended by the developers of both projects.