To my knowledge there has never been a HOSTS file fix to resurrect the HP/Palm app catalog, so I don't think you're missing anything there.
Originally Posted by mypalmpred
For that particular app, the terms of service state "Due to current limitations of webOS, all photo processing must be done on our web servers. Your photo will be uploaded to our servers, processed, and then downloaded back to your phone."
So even if you get an IPK for the app, there will be a question of whether Rusty Apps is still operating the server-side processing...
EDIT: My bad, the server-side processing was for the earlier, non-Pro version. I can't help you with an IPK, but if you get one it may work!