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When installing Service Pack #1 (SP1) for JTX 3.0 on a machine that does not have ArcGIS .NET Support installed, the following error occurs:
"Error 1722. There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor"
ArcGIS .NET Support has not been installed on the computer.
Install ArcGIS .NET Support and SP1 for JTX 3.0 as well.