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Contrary to some open-source libraries, DevExpress uses a proprietary licensing system. You cannot download the installer via a simple wget command without authentication. Here is the official process.
Add a new package source with the DevExpress NuGet URL: https://devexpress.com (requires your unique developer authorization token). download devexpress 21.2
If you are an existing DevExpress customer, you can also download DevExpress 21.2 from the following sources: Contrary to some open-source libraries, DevExpress uses a
Complete rewrite of the data grid component for faster rendering. Contrary to some open-source libraries