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The following error message is displayed when trying to install:
Error: Error 1500. Another installation is in progress. You must complete that installation before continuing this one.
The installation process is hung.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.