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Download Developer Edition of CryptoSys PKI Pro

Developer's Licence. Allows full incorporation into your applications for distribution to third parties world wide. The Developer Edition works on all modern Windows platforms and replaces the Trial Edition.

File Details | How to Install | Upgrade | x64 Build | Integrity Check | Support

Enter your details below and click on the Download button to receive your licensed copy of CryptoSys PKI Pro (read the licence terms).

Your Licence ID is in the Delivery Information email from FastSpring you would have received when you purchased it (Where is my my licence ID?). It consists of 14 characters of the form:

Your licence ID is VRxxxxxxxxxxxx
Registered name or email:  
Your licence ID: (14 characters beginning with "VR")
  I agree to the download conditions.

If you purchased more than one licence, the Licence IDs will be listed one after the other. Just use one ID at a time to download.

Trouble installing: If Microsoft Defender Smartscreen gives you a warning, see Unrecognized app error. (TL;DR Click "More info" then "Run anyway"). Check that you see "Publisher: D.I. MANAGEMENT SERVICES PTY LIMITED".

Credit card statement:
Your credit card will be billed by FS* or FS* If your purchase was made using a company credit card, please make sure the purchasing officer is made aware that this entry will appear on the company credit card statement.

Where is my invoice?

Download conditions

File Details

The latest core DLL file version is 22.0.x.0, compiled 23 October 2023.

There are separate core DLLs for Win32 and X64 platforms, which will be installed in the correct directories on your developer machine by the install program. The CryptoSys PKI Reference Files folder contains copies diCrPKI.dll.win32.copy and diCrPKI.dll.X64.copy (just rename them as .dll).

The .NET library is compiled for both Win32 and X64 platforms and targets .NET 4.0 and above; that is, VS2010+.

How to Install

Save the file to your hard drive, unzip it, and double-click on install.exe (and perhaps read the instructions in readme.txt :-). On setup, the latest version of the Developer Edition of the DLL will be installed on your system and will overwrite any existing version. You need to have administrator rights when installing on your own developer machine. There are instructions included on how to distribute to your users (see the file distrib.txt). Do not distribute this install file or your Licence ID to your end users.

Can't download?

If you cannot download the file and have recently purchased the product, please contact us and quote your Licence ID or purchase transaction number. Note that only licence holders who have purchased or upgraded to CryptoSys PKI v22.0 since its release in October 2023 can download from here (Licence ID beginning with VR). See Expired below.


Free downloads are available only for a limited time after the date of purchase, or until a new version is released. (Note that your original download and its licence for use is still valid, and you may continue using it, subject to the licence conditions.)

DISCOUNT: Emails were sent out in the week beginning 2023-10-23 to the registered address of existing licence holders with a coupon to upgrade at a discounted price. These offers have now expired. The only way to upgrade now is to purchase a new licence. However, if you have ever purchased a licence for an old version of CryptoSys PKI, you might be eligible for a discount if you ask nicely.


Upgrade to the latest version (note the comment above about asking nicely for a discount).

x64 Build

The install program includes an alternative core DLL compiled for 64-bit machines. It should install both the 32-bit and 64-bit core DLLs in the correct Windows system folders. Windows will automatically select the correct DLL for the platform of the application you are running. For more information see using on a 64-bit system.

Integrity Check

Check the integrity of your CryptoSys PKI software.


For support, see the PKI Pro Toolkit support page.

We will gladly respond to "quick" technical support questions via email. You can usually expect a reply within 48 hours. We reserve the right to charge for our time for more detailed programming issues or for problems not caused by our software. Note that the fee paid for the licence is solely for the licence and the right to download one copy of the software.

This page last updated 1 December 2023

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