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Unable to validate key


I have a valid license for 2018.2, and have installed it before. I uninstalled it from the Control Panel, since my project wasn't compiling.

But when I try to install it again, I'm getting the following error: There was an error validating the key: {0} System.ArgumentNullException.

I'm presuming the uninstall was not clean. How can I wipe out all traces of Infragistics, and make a fresh start?