I have downloaded the 1,200 Kb MasterCollection_CS5_5_LS1 file, and the 5,308,103 Kb MasterCollection_CS5_5_LS1.7z file from the Adobe site. I extracted both with WizZip. How do I now install the software for the trial version?
You should be able to locate Setup.exe in the extracted folder. If you are unable to then please try extracting the files using MasterCollection_CS5_5_LS1.exe which I believe is one of the two files you downloaded.