I've got an earlier version installed though the wizard. PPA install instrutions says uninstall any previous wizard version from /usr/local/ but I can't find any info on how you do this. Is it safe to just remove /usr/local/bin/kdenlive/ ?
I am sorry to say that since you installed it to /usr/local, it is not easy. If you had installed it to $HOME/kdenlive, you could have just removed that folder. Sigh - now you have a big mess!
In /usr/local, delete:
lib/libav* (first check to see if there are non-ffmpeg libs that match)
include/libav* (folders - check to see if there are non-ffmpeg matches)
There could be more, but this is what I was able to dig up.