Let's get you to the right support that can help you with this, civitainstitute.
To add more users to your QuickBooks, it would be best to get in touch with our Customer Care Team. They can also help you upload your files from the 2011 version of QuickBooks to the one you currently have.
Here's how to get their contact number:
Don't hesitate to reach out to me again if you have more questions.