It’s on their MS Saturator page, with the audio demos, so you can hear it there before you buy.
After you buy, they send you a code. Redeem it in your account here and MS Saturator appears there with its licence key and the installers for Mac and Windows. Updates reach you the same way as for anyone who bought it on this site.
Thanks to Producer Sources for adding it to their shop.
MS Saturator 2.0Drive the sides hard and keep the centre clean.MS Saturator — €69