Hazel 2.2.2 installed but not showing in prefs

I installed the 2.2.2 update the other day. After that I noticed it wasn't running. I went to check my sys prefs today and saw that it's not listed there. So I tried reinstalling it again and I get a message asking me if I want to replace it as it already exists. I say yes, but it still doesn't show up in my system prefs.
Any ideas?
I'm running 10.5.5 PPC.
Thanks
Any ideas?
I'm running 10.5.5 PPC.
Thanks