Autosave feature - how do I include this with my forms? Also what is jotformpro?

With the V4 builder all your changes are automatically saved, there are only some parts of the builder that will need you to click on the save button, but are only a few ones. 

Regarding JotForm Pro, it refers to any paid account, you can check our pricing here: https://www.jotform.com/pricing 

JotForm has an enterprise version as well, more  details can be found here: https://www.jotform.com/enterprise/ 

I hope this helps.