It may be that you have not yet "killed" or cleared the download from the dl screen so LW is laucnhing into that when you attempt to launch/unstuff a file. Worst case scenario, for the unstuffing, just drag the file onto stuffit expander.

For the launching bit, make sure the program (which I assume you dled legally) is for mas os 9.2.2 and cleared. Try launching it again.