Mohamed Medhat Salem https://library.gom.com/pinaccess/pinaccess.do?pinCode=phcqN2PnDOvR
Here you can dowload the software. Apparently, the 3D is just an option of the software which is available with additional cost that's why they claim to offer a 14 days trial for free on the official website. I think that after this period, you will only be able to deal with the 2D mode which is the basic feature.
On a website I found following information
"The “GOM Correlate” software is free to download and use with standard features … the “professional” module offers all the powerful capabilities of the software."