Hi....yes I did it with a quickbooks agent yesterday using the tool hub. it worked. 

Note however I do not use any advanced features in enterprise...so the conversion was easy.

First you need to buy the QB Pro License, download it. Then download the tool hub. You then take your company file and convert it with an agent over the phone using a special one time code they give you over the phone.

I did not need to use a 3rd party.