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 | x64 Build | Integrity Check | Support
Enter your details below and click on the Download button to receive your licensed copy of CryptoSys API (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 CVxxxxxxxxxxxx *********************************
If you purchased more than one licence, the Licence IDs will be listed one after the other, separated by a space or semicolon (;). Just use one ID at a time to download.
Credit card statement:
Please note that your credit card will be billed by by FS*fsprg.com or FS* cryptosys.net.
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.
The latest core native DLL file version is 6.22.x.1 compiled 7 January 2024.
There are separate core DLLs for Win32 and X64 platforms, which will be installed in the correct directories on your
developer machine by the setup program.
The CryptoSys API Example Files folder contains copies diCryptoSys.dll.win32.copy
and diCryptoSys.dll.X64.copy (just rename the required file as diCryptoSys.dll).
The .NET library diCrSysAPINet.dll is compiled for both Win32 and X64 platforms and targets .NET 4.0 and above; that is, VS2010+.
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.
(The option Install for Server when installing just means it disables pop-up messages
if you try and run it without installing correctly.)
There are instructions included on how to distribute to your users (see distrib.txt).
Do not distribute the install.exe file or your Licence ID to your end users.
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 CryptoSys API v6.0 and above since
March 2021 can download from here (a Licence ID beginning with CV).
See Expired below.
Free downloads are available only for a limited time after the date of purchase. (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 29 May 2023 to the registered address of existing licence holders with a coupon to upgrade to version 6.21 at a (very) discounted price. That offer has 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 API, you might be eligible for a discount if you ask nicely.
The setup 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. Note that the 32-bit ActiveX/COM interface is not supported by 64-bit Microsoft Office.
Check the integrity of your CryptoSys API software.
For support, please send details of your problem (including programming language, operating system and your licence ID) using our contact 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 10 October 2025
