I have Photopress version 1.0.2 installed, yet the latest version available from WordPress.org is 0.9.8. Be advised, there is a newer version at the author's site (if it's available, it's down for me right now).
Also, the version from WordPress is incorrectly packaged, when you extract the zip file you will get this:/
You need to move the second photopress directory into wp-contents/plugins or it will not be recognised.
Cheers - Callum.