[escimo]

...able to get PROworks/PROcompiler running w/o issues under Solaris 2.4 x86 within VM. Yes, not PPC because in lack of HW.

Nevertheless, included license.dat file is valid for all three architectures/ISA's: SPARC, PowerPC, x86

Just set the "offered" domain name, e.g. within /etc/defaultdomain (reboot safe) and/or with command
# domainname sun.com
(at runtime)

https://youtu.be/wNei6mEBe7E

Maybe one day the install media is available on archive.org as well. Crossing fingers.