What's the difference between "Individual SN" and "Unified SN"?

What is a perpetual license? Do I need to pay monthly fees for the software?

Can I use Reallusion software/content, and developer created contents, to create digital art to sell on NFT platforms?

Are there any discounts on multiple seat purchases?

I would like to set up a workgroup with different user accounts. How can I do that?

Can I install one license on two different OS platforms?