As usual, I run my (Windows XP) system as an unprivileged user (limited account). I downloaded and installed a theme. It seams as if the package get installed in
%APPDATA%\Stardock\SoundPackager
This is kind of good... getting away from the %PROGRAMFILES% folder... but in case you're connected to a domain, and the domain uses roaming profiles, this folder will be saved on the server when logging out. In case there are a lot of packages the logout/login procedure will take more time than required. There is the LocalSettings folder, which doesn't roam, in case one may consider a sound theme as temporary.
Is there a way for me configure where SoundPackager will search for packages. Is the %ALLUSERSPROFILE%\Application Data searched?
If this is the case, then all users on the machine could benefit from one package repository.