i'm using Photoshop CS2 (German Version). After installing Focal Blade 1.04b and running the plugin installer i don't see Focal Blade in the Filters menu.
Unfortunately Adobe localizes the names of the Photoshop sub folders including the Plug-Ins folder. For example in the German versions the "Plug-Ins" folder it is called "Zusatzmodule" and in the french version it is called "Modules". I do not know any other company that does that. A very bad habit.
If you use the Plugin Installer that is executed at the end of the installation, it automatically detects the appropriate folder no matter which localized version of FocalBlade you are using.
You probably had an English version of Photoshop installed earlier. I do not know why the German Photoshop installation does not overwrite the English plugin folder location in the registry, but I found the same problem on another person's computer.