I still have the original e-mail they sent me, below the requirements section to do it online (OS X or Windows PC, Webcam, Microphone, etc), they say:

> If you do not have a webcam, your computer doesn’t meet the technical requirements, or for any reason you'd prefer to take the exam at a proctored location near you, please let me know. I’ll need you to provide your full legal name and current address, and I’ll be able to make alternate arrangements.

I believe the company they use to proctor these tests offers physical locations if you do not have access to a computer with the requirements