Strange, for me it worked. After extracting tha archive when i pressed Find Library it said it already found it and if I still want to browse manually. I said no and it worked fine.
Maybe you didn't restart Audacity after extracting? My only idea...
If you want you can upload your files somewhere and PM me the location, I can convert and resend them to you.
I'll give everything a reboot and see if that helps out.
as for the conversion, the aforementioned trial version seems to be doing the job (sort of, although it only converts half of the files you want to convert at a time >_>) so it's a quick temporary fix.