I have not done much Flash development but the one time I had to do something, I needed a previous version. So from the download page, there was a link to download older versions. The problem was that as soon as the older version ran, it said there was a newer version available and refused to continue unless the newer version was installed.
As I said I'm not a Flash expert so maybe I just missed a memo somewhere but I found it strange that they offered the older versions but those refuse to run because there is a newer version available.
Maybe there is a registry setting or something but it certainly wasn't obvious when I tried to get it to work.