NAG Downloads - Fortran Library

Specific download information:

  • Fortran Library, Mark 23
  • For Microsoft Windows XP/Vista/7 DLL
  • Using Intel(R) Fortran Compiler for 32-bit applications Version 12.0 and compatible (including Version 11.0)
  • File size of Fortran Library
    34.3 MB ; 36005282 bytes
  • File size of Documentation:
    112 MB ; 118269560 bytes
  • NAG Product Code: FLDLL234ML


The software is provided as self-extracting executable.
Download it from here (34.3 MB),
and then run fldll234ml_setup.exe to install the Fortran Library.

For further installation instructions, please refer to the Installer's Note and Users' Note .


You can access the documentation on our website here.
You also have the option to download the self-extracting executable from here (112MB),
and then run setup_fl23_manual.exe to install the Fortran 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 response centre

Trial Request

For more information please fill out the trial request form.

Product Purchasing

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