How to downgrade to older version of Quicken Mac

socrates

I installed version 6.6 and it messed up 20+ years of data. It's a mess. I've read that some people have gone back to a more stable version. I think 6.4.5. However, I can't find how to download an older version. Can anyone help? I just can't believe how messed up this is. I've already turned off Quicken Cloud, as I've read that is part of the problem.