I can confirm that fixes/fixes is a no-go at the moment !
Looking into it right now. It seems that FPC cannot find its own config file. Reason unknown [yet].
I wish I had looked before I tried to update.
But I have a backup, so...
Also, I was able to install Fixes FPC alone, although Fixes/Fixes failed if done together. Lazarus Fixes fails, of course, no matter whether it is done alone or in tandem with FPC.
I successfully rolled my config back to what it was previously (shown in my sig), so I am fine now.
Hope this helps.