Being somewhat of an impatient masochist, I created this symlink to allow the package to finish installing:/usr/lib/policykit-1/polkit-agent-helper-1 -> /usr/libexec/polkit-agent-helper-1
Then I rebooted and found a lot of stuff not working or working really slowly and systemd complaining it couldn't find polkitd. So I made another symlink and rebooted:/usr/lib/policykit-1/polkitd -> /usr/libexec/polkitd
Oh, and in case it's unclear or something gets lost in translation, I highly recommend against the symlink hacking unless you've already upgraded and have a dysfunctional system.