Current is version 2015 so I don't know if a 30 day trial of version 2014 is available
You can purchase a month to month subscription for InDesign CC 2015, you'll get InDesign CC 2014 as part of the subscription. Click here to purchase : https://creative.adobe.com/join/single_app/month/indesign
Please go through the Terms of Subscription for Month-to-month subscription before Purchasing: https://www.adobe.com/misc/subscription_terms.html
Let us know if this helps.