Download Error Code 4001?

If you are testing your code, or going to other pages with Silverlight running and seeing this error:



It is not your fault!

This is the result of a recently discovered bug that we know how to fix. We are working hard to get that fix out so that you won't run into this problem.

For now, the work around is this: if you try the page again, you'll usually find that it will load just fine (or the second or third time <smile>.)

I will post as soon as we have more information, and I apologize for the inconvenience this may be causing.

About Jesse Liberty

Jesse Liberty has three decades of experience writing and delivering software projects and is the author of 2 dozen books and a couple dozen Pluralsight & LinkedIn Learning courses. He was a Senior Technical Evangelist for Microsoft, a Distinguished Software Engineer for AT&T, a VP for Information Services for Citibank and a Software Architect for PBS. He is a Xamarin Certified Mobile Developer and a Xamarin MVP and a Microsoft MVP.
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7 Responses to Download Error Code 4001?

  1. Fahar says:


    Different solution given at this link:


  2. jason says:

    is there a fixed for this?

  3. zak says:

    Hi all, any news on how to fix the problem please? I googled but did not succeed in finfind some clear tips :s
    thx in advance for your help.

  4. J says:

    I uninstalled any version of SL and reinstalled. Still no succes……

  5. Ron says:

    Hi, I

  6. Erick says:

    Hi there,
    Any news about this issue?,
    i am using Silverlight 4.0.5 and this error is happening , is there any other workaround appart from trying the page again??


  7. Jacob says:

    I am using Silverlight 4 and still get this error, why?

Comments are closed.