Both 0.6.0 and 0.6.0.1 installed fine for me without errors, but something about 0.6.0 really mangled my config. Even uninstalling catoriseplus and installing the original catorise still left my categories really messed up, even after reboot. But I manually removed every catorise-related file and folder I could find on my file system and started from scratch. After doing that and reinstalling 0.6.0.1 my n900 seems happy now.