CPU-X is available as an AppImage. There are two variants:

• continuous versions (CPU-X-x86_64.AppImage): edge release
• versioned versions (CPU-X-vX.Y.Z-x86_64.AppImage): stable release

Other users are not allowed to access to the FUSE volume under /tmp/.mount_CPU-X-xxxxxx/, so pkexec is unable to access the daemon binary.

Two solutions: 1. start AppImage as root or 2. extract AppImage with --appimage-extract argument, then run AppRun under squashfs-root directory
FUSE is not longer required (#384).

If no authentication agent is available on your system, pkexec will fail

Two solutions:

1. start AppImage as root
   or
2. start an authentication agent (example: https://wiki.archlinux.org/index.php/Polkit#Installation)