DisplayCAL relies on Python2, which is not supported since Fedora 32.
You can download the required packages compiled for Fedora 31, that will work for versions 32/33/34:
- python2-wxpython
- puthon2-gobject-base
- python2-gobject
- DisplayCAL
wget https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-wxpython-3.0.2.0-26.fc31.x86_64.rpm https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-3.34.0-3.fc31.x86_64.rpm https://archives.fedoraproject.org/pub/archive/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-base-3.34.0-3.fc31.x86_64.rpm https://rpmfind.net/linux/fedora/linux/releases/31/Everything/x86_64/os/Packages/p/python2-gobject-3.34.0-3.fc31.x86_64.rpm https://displaycal.net/download/Fedora_31/x86_64/DisplayCAL.rpm