how to install 7.6.1?

I'm just sick and tired of 7.7.2 locking up on me constantly over the last 6 months or so. "Can't find server" is the constant refrain. Complete reboot of my computer seems to be the only thing that (temporarily) works. I'm tired of monkeying around on a fix, and am convinced that, short of buying a new desktop computer just to run the software, I need to do something once and for all. Reading posts on here, folks are having some success reverting to 7.6.1. How do I do this? Where can I find it?

Thanks.


(*Running Vista Home on a PC, Transporter, and Duet.)