Official CPDK Version 8.0 download (Download Center item 30688) currently returns HTTP 404

Elena 0 Reputation points
2026-08-22T05:26:17.35+00:00

Hello,

I am reporting an apparent problem with the current official Microsoft acquisition path for the Cryptographic Provider Development Kit Version 8.0 (CPDK).

Microsoft Learn still directs developers of CNG cryptographic algorithm providers and key storage providers to obtain the Cryptographic Provider Development Kit from Microsoft.

The current Microsoft Download Center page is:

https://www.microsoft.com/download/details.aspx?id=30688

It currently publishes:

  • Cryptographic Provider Development Kit Version 8.0
  • File: cpdksetup.exe
  • Size: 1.2 MB
  • Date Published: 7/15/2024

The current official Download action resolves to this Microsoft-hosted endpoint:

https://download.microsoft.com/download/1/7/6/176909b0-50f2-4df3-b29b-830a17ea7e38/CPDK_RELEASE_UPDATE/cpdksetup.exe

I reproduced HTTP 404 Not Found from that exact endpoint.

One controlled request used:

  • GET
  • HttpCompletionOption.ResponseHeadersRead
  • AllowAutoRedirect=false
  • one request only
  • no response-body read
  • no package download
  • no package-file creation

An earlier controlled same-machine check using three User-Agent profiles also returned HTTP 404 for all three profiles.

I also reviewed the available official Microsoft-owned CPDK acquisition references. I did not find a distinct current official alternate delivery path or a separate official historical/archive/republication path for cpdksetup.exe.

I am not concluding that CPDK has been retired or discontinued, and I have not found official evidence establishing a replacement package.

Could Microsoft please confirm whether Download Center item 30688 currently has a broken download action?

If it is broken, please either:

  1. restore or correct the official Download Center download action; or
  2. identify the current official Microsoft acquisition path for Cryptographic Provider Development Kit Version 8.0 / cpdksetup.exe.

If CPDK has officially been relocated, superseded, or replaced, please provide the current official Microsoft documentation identifying that change.

The package body has not been downloaded or inspected.

Thank you.

Windows development | Windows API - Win32
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3 answers

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  1. RLWA32 52,816 Reputation points
    2026-08-22T06:42:15.5+00:00

    I just tried the download link and the browser displayed -

    cpdk

    Clicking the Download button successfully offered the the cpdksetup.exe file.

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  2. Taki Ly (WICLOUD CORPORATION) 4,440 Reputation points Microsoft External Staff Moderator
    2026-08-24T04:30:33.2966667+00:00

    Hello @Elena ,

    Thank you for the detailed report and the careful, controlled testing you described.

    I re-tested both the Download Center page (item 30688) and the direct hosted endpoint for cpdksetup.exe from my side. In my checks, the Download Center page loads normally and the direct download endpoint currently responds with HTTP 200 and successfully serves cpdksetup.exe. Another community member on this thread also reported a successful download of the file.

    Based on this, it appears the HTTP 404 you encountered was most likely a transient or region/CDN-node–specific condition on download.microsoft.com at the time of your request, rather than the CPDK package being retired, relocated, or superseded. I did not find any official documentation indicating that CPDK Version 8.0 has been replaced or moved, and item 30688 remains the current official acquisition path.

    Could you please try the download again from your environment? If it still returns 404 for you, it would help to know:

    • your approximate region / the closest CDN edge,
    • whether it fails through a proxy/corporate network vs. a direct connection, and
    • the exact timestamp of a fresh failing request,

    so the intermittent behavior can be investigated further. If you found my response helpful or informative, I would greatly appreciate it if you could follow this guide for your confirmation.

    Thank you.

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  3. Taki Ly (WICLOUD CORPORATION) 4,440 Reputation points Microsoft External Staff Moderator
    2026-08-24T02:00:45.5833333+00:00

    Hi @Elena ,

    I'm working on this issue and will try to get back to you soon. Thank you for your patience.

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