If you deactivate your current license, you should be able to access all features in the demo mode (minus the demo limitations). Then, after using the demo, you can re-activate your license.
I see the features are blocked in the demo. We have an Ajar Academy course that walks through the features step-by-step: How to Create a One-Page Scrolling Website with InDesign & in5
Though you need to subscribe to Ajar Academy for the entire course, you can click on the button to "Watch Promo" for a free video overview.
Another option for you would be to purchase the Gold Plan for one month: in5 Purchase (select monthly in the drop down box). If you decide to upgrade to an annual subscription, we will be happy to pro-rate the amount you spent on the monthly plan. If you decide you don't want to use the Gold Plan within 30 days, we can refund the purchase price for you.
Here is more information about upgrading: Can I upgrade my in5 plan? Is it pro-rated?