Where can I download a previous version of PT4?

Ever since I have upgraded, it's been unusable. I don't care if it's recommended or not to downgrade, I want to try, so I can actually play

HUD loads for a while, but then eventually starts to clog up, seemingly irrespective of the number of tables/sites being played. Players stats don't update at all, are occasionally not even there, and most of the time my stats don't display at all. As a whole, a bunch of features on the HUD become l...