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A previous installation of ThingWorx Foundation for MSSQL has been found. Uninstall the existing installation and then reinstall ThingWorx Foundation for MSSQL. If you are upgrading ThingWorx Foundation, you must first ensure that all prerequisites are met. Do you want to review the prerequisites in the help center now ?
Hi,
Have a look at the following article - "ThingWorx 8.5 Foundation/Flow installer for Microsoft SQL Server failing to complete successfully": https://www.ptc.com/en/support/article/cs316619