The Toaster 4.3 software can install both the 3.1 and 4.2 Toaster software. The 4.x series has better versions of Toaster Paint and Lightwave. 3.X is better for live video switching. The 4.3 software can be downloaded from the EAB ftp site. You have to search for both the CD image and the ADF of the install floppy. There are some long threads on EAB on Toaster software.