Sorry, this one is a false alarm, there is no problem. The correct procedure for running a light mode setup can be a bit tricky. In a nutshell:
a) If you are running a web or compressed build, you need to extract it first using the Extract 7Zip Archive command
b) Then, or if you are running an uncompressed build, you can call the Run Light Mode Setup command
I usually like InstallAware for its simplicity. This however seems a bit like a kludge to me. Maybe you can update the command to do this automatically (including cleanup) in the next version? Thanks!
THe workaround I use is similar to the one Sinan posted except I display a progrees dialog while the extract command is running, I agree however that cleanup afterwards is a problem there is no way of deleting the extracted files and from the temp directory you create.
To make the cleanup easier...you can just extract to a subfolder of $SUPPORTDIR$, say $SUPPORTDIR$\\light. $SUPPORTDIR$ is always recursively wiped at the end of the master setup...so you wouldn't have to worry about manually deleting anything.