Red Giant has announced that they have lost the rights to the technology behind Magic Bullet Denoiser. It seems Google has bought Green Parrot Pictures, and they own the technology behind Magic Bullet. So the old version of Denoiser will still work, but you can no longer download it from their web site.
They are going to make a new Denoiser, Denoiser 2, which current owners will get for free, and they promise to get the same level of denoising.
I personally hope it is more stable than the previous version, as I often have a lot of problems with it.