you can download 32v here: https://sourceforge.net/project/downloading.php?group_id=204974&filename=unix32v-0.3.exe&a=43027585
As a simple windows installer. Just install and run and you'll be at the login: prompt in no time!
Unix32v is the common ancestor to both 4BSD and SYSV. While primitave by modern standards, this is the version where all 32bit unix's can be traced back to. This is also the release that was central in the AT&T vs CSRG lawsuit.
This version is FREE thanks to the old Caldera license.