I just installed the newest version of Litestep.
In the installation options, I unchecked "Set as shell" so I would keep explorer.exe as my shell for this account, but left "Apply desktop background" checked. Now the installation has frozen. I'm assuming that the desktop application calls a Litestep function to change it, and since Litestep isn't my shell, it isn't working and the installer has frozen.

I don't know who builds the installation files, but this is something that should be fixed.