Our install used to work fine on Windows 2000 with no service packs. We recently tried it again, and now get the message:
"This installation package cannot be installed by the Windows Installer
service. You must install a Windows service pack that contains a newer
version of the Windows Installer service."
We haven't changed anything in the installation itself, and our Supported Operating Systems setting is still "Windows 2000". The installation just copies files and installs one service. We're using AI 2.3.