Missing MDS Temp Directory

Koen Verbeeck ran into an error when reinstalling Master Data Services on his Windows 10 box:

The error this time: “The ‘tempDirectory’ attribute must be set to a valid absolute path”. If you can’t see the error, it’s possible you have to enable them in the web.config file of MDS. Typically you can find this configuration file in the folder “C:\Program Files\Microsoft SQL Server\130\Master Data Services\WebApplication”. The customErrors attribute should be changed to the following:

Read on for the solution.

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