Saving a prepared form

I've created a form in InDesign with fields to fill out. I export as an Interactive PDF. In Acrobat I "Prepare the form" so it recognizes all the fields I have already created and it allows me to distribute it to people in the company.

This is a professional assessment form which will need to be sent out to a few people at separate times, not by me but someone in HR.

I don't seem to be able to save the "Prepared Form" that is ready to be sent out (that is the screenshot with the words in red boxes). If I hit save, then open it, it loses the 'prepared' fields (screenshot with light blue boxes). I have to go into "Prepare Form" everytime to get it ready.

I'd like for the PDF to be already "Prepared" and ready to distribute when the person in HR opens it. 

Also, will they be able to prepare a PDF if they only have Acrobat Reader?