The Evaluation Version of GiD is completely functional but geometry is limited to 25 surfaces and meshes are limited to 1000 nodes. This Evaluation Version can be downloaded for free.
The Professional Version of GiD is the full version without limitations. You can either download the Professional Version from Internet or order the CD. A licence number and a password is required to run this version of GiD.
The installation file you can download here incorporates both the Evaluation as well as the Professional Version of GiD. If you are not a licence owner (i.e. if you do not have a password) GiD can only be executed in the Evaluation Version with the limitations mentioned above. The Evaluation Version can always be upgraded to the Professional Version at a later time. To do so you need to purchase a GiD user licence. Then use your personal licence number to obtain the GiD password on the Get GiD Password page. This password will allow you to work with the unlimited Professional Version of GiD.
Note: In the download version of GiD only the Reference Manual is included.
Go to the Support section to download the GiD User Manual and the GiD Tutorials.