Get in touch with the sales team. That's literally their job.

If you have not yet already, be sure to check out the fourth FAQ on our Free Accounts support page! To find more information about upgrading your account, you can also navigate to the Plans tab found in your Account Settings.

Good luck with this one.
According to the documentation, you have to upgrade to the CoreXM Standard plan to export your raw data, but do so at your own peril. It often takes some time for the account upgrade to actually go through, so do not do this if you are in a rush.
For example I paid $360 to upgrade 5 days ago and still have not been able to download my raw data. All in all, strap yourself in for some frustration.