I do not have the time anymore to maintain it, and maintain it professionnaly.
Maybe i would work on it later, but be aware it could take years or never happen.
If you want to be notified when it is up again you can follow playlist converter on Facebook and Twitter.
Sorry for the inconvenience and feel free to use other alternatives.
Use the api with Node.js
This gist shows a simple way to generate a link to a playlist to convert.