I have never had any problems downloading previous versions of Spy Sweeper, but this time, I had problems. After installing, it told me to restart the computer. I restarted, and then I saw the blue screen of death (a stop error). Then I rebooted the computer again, and a black screen of death appeared. I chose "Last Known Good Configuration", and a Spy Sweeper window popped up and told me there was a problem with its installation. So, I restarted again, went into Safe Mode, and tried re-installing it from there, but I got the blue/black screens of death all over again. I ended up uninstalling Spy Sweeper.