The coupon code will be made available by Bits-du-Jour on June 10.
You can go ahead and install the free version right now. At the end of the installation you'll be told about the promotion and how to get notified by email on sale dale.
After the registration, you'll only have to enter the registration key into the copy you already installed to turn it into the PRO version
Sorry for resurrecting the old thread, but for those of you who's interested the player is now distributed free of charge. It is also open source now, but I no longer develop it.
So if you are looking for a lightweight way to listen to your mp3's or want to convert music or record internet radio with no hassle, Spider could be just what you are looking for: Spider Player - The Ultimate Music Player