Even if you got the source file from any one you cannot prepare the host or install the nsx agent on the esxi host without licenses.
If you want to study or learn more you can use VMware HOL VMware Learning Platform
I built my NSX-V LAB on PC machine with 64 GB RAM using VMware workstation. you can find the details in my blog Building NSX-V LAB - MF blog and you can also find the how to to implement the NSX-V environment How To install and configure NSX-V 6.4 - Part 1 - MF blog . try to use the minimum resources of the Virtual appliances and machines.