I believe an older version is available on the AB site. I downloaded a copy a while ago. the best way to get the most current software is to buy a starter kit. I think the panelview 300 starter kit is about $600 Can.
I just download a copy about 2 weeks ago Panelbuilder 32 ver 3.61. It asked for a serial number during the install, but I just put one in and it worked.