All Corsten's Countdowns are posted on this forum with download links. I try to keep them working as much as possible, but it is possible that some of those links won't work anymore.
When you see a nice tracklist from an old episode and you want to listen to it, but you don't have it and you can't download it anymore, no need for immediate worry.
I have all episodes. Just post a request in this thread and I will re-upload it and post it again in the already existing thread from that particular episode.