I updated the app as usual, but as I was busy this time, I didn't read the update popup and just agreed, then installed when it had finished downloading. Imagine my surprise when it asked me for my registration details. The fee for the new version is $23.60 (£14.99) with 25% introductory discount. I know ClamXav is regularly recommended on this forum, but if you're not already a registered user, you're S.O.L. Feel free to let me know how invaluable the app is, and how it's worth every penny ....or Not as the case may be.