Just like the previous test version (RC1), the application does not come with an installer, nor are there any text plug-in files (.dct files) included. Simply downloading and running the application suffices for a quick test.
Disk Cleaner for XP/Vista/7 - version 1.6.1273 (RC2) released
A new test version (1.6.1273) is available from here. Please post bug reports in the forum.