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We ran into this issue while trying to upgrade from Alteryx Server 11.5 to 11.7; the first step of uninstalling the previous version failed, not only once, but three times in different servers, leaving us with a corrupt installation; we tried reinstalling 11.5 but that also failed; this is how we fixed it:
Delete the installation directory, typically C:\Program Files\Alteryx; remember to save anything you may have added under this folder, such as custom macros, before deleting this folder.
Run this Microsoft Fix problems that block programs from being installed or removed troubleshooter; since we install both the Server and R (Predictive Tools), we had to run the troubleshooter twice; however, this is so much easier than hunting down all of those Alteryx and SRC entries in the registry, and safer too. Also, this will run for a while, do not worry, it works.