Use the version verbose CLI command.
Example of Standard software image
PacketShaper# ver ver
Version: PacketShaper v9.2.12g1 2015-09-16
Product: PacketShaper 7500
Example of ISP software image
PacketShaper# ver ver
Version: PacketShaper/ISP v9.2.12g1 2015-09-16
Product: PacketShaper 7500/ISP