Is it possible to have a meeting if only one party has zoom?

You don't need a paid license to be a participant in a Zoom meeting. You don't even need the software installed if you're on a computer, you can join from the web browser. You will need to install the app if you want to join from a mobile device. 

Hello,
My name is Brandon. Thanks for joining the Zoom Community! Zoom is accessible to anyone who wishes to have an account. You do not have to pay for an account. Please go to zoom.us/signup to sign up for an account if you wish to. You do not have to have a Zoom account to join someone in a meeting to answer your question. Just click on the join link (URL) from the person sending it to you, and you can join the meeting through the web browser you are utilizing. I recommend that you download the software at Zoom.us/download so that the functionality of Zoom will work better for you.