Hello,
If you are are referring to ACS Solution Engines being decomissioned in order to install ACS for Windows on VMWare boxes then you require a Software Contract in order to get the ACS for Windows version.
ACS 3.x or 4.x are not licensed based applications but instead contract covered. If you do have a Software Contract that covers the ACS for Windows software then you might want to open a Cisco TAC Case as the Full(Base) Version of ACS for Windows might be published by TAC representative.
NOTE: Full(Base) version of ACS 4.x are not available at Cisco.com. You will only find ACS patches or minor upgrades but not the base version to install it on a Windows Server running on VMWare.
Hope this helps.
Regards.