NAG Downloads - C Library

Windows XP/Vista/7 x64, Intel C/C++ or Microsoft C/C++

Specific download information:

  • C Library, Mark 23
  • For x64 systems compatible
  • Using Intel C++ Compiler Intel(R) 64, version 12.1 and compatible
    Or Microsoft 64-bit C/C++ compiler, version 16.00 or compatible
  • File size of C Library
    146 MB ; 154012382 bytes
  • File size of Documentation
    98 MB ; 102578928 bytes
  • NAG Product Code: CLW6I23DAL


The software is provided as self-extracting executable.
Download it from here (146 MB),
and then run clw6i23dal_setup.exe to install the C Library.

For implementation specific information, refer to the Installer's Note and Users' Note.


You can access the documentation on our website.
You also have the option to download the self-extracting executable from here (98 MB),
and then run setup_cl23_manual.exe to install the C Library Manual.

Licence key

To enable the use of your NAG software you will need a relevant licence key. Instructions for obtaining a licence key are included in the products Installer's Note. Alternatively you can complete the ‘Request a Licence Key’ web form here. If you've already been supplied with a licence key from our Support Desk then you will not need to complete this form/request a key. In the event of difficulty please contact your NAG Technical Support Service.

To enable the use of your downloaded NAG Software you will need a relevant licence key. Please click here to request a licence key.

Trial Request

For more information on trialling NAG software click here

Product Purchasing

The product can be purchased by contacting one of our offices.

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