Currently, Mullvad VPN client will not run on Fedora 24/25 due to a bug in pygtk2. I've created a patched version that may also work on other RPM-based systems.
sudo dnf copr enable slethen/mullvad sudo dnf install mullvad
My modified source is hosted on GitHub
Fedora Copr builds are automatically compiled from these sources
This code is not supported by Mullvad, please don't send bug reports to Mullvad relating to these packages. Feel free to report any Fedora specific issues on my GitHub page.