Everything is here and here:

https://nxsforum.com/topic/55/how-to-enable-solo-mining

https://nxsforum.com/topic/56/nexus-faq-s

and their website ( http://www.nexusearth.com/ ) under DOWNLOADS is LLD wallet and LLD database...

I am not affiliated with NXS, I just switched off from zcash and ETH mining and making way more.