You can obtain evaluation licence and start using your 30-day trial by filling this form: https://www.teamdev.com/dotnetbrowser#evaluate.
This article describes how to install any licence file, including Evaluation, Development, and Runtime licences.
If the teamdev.licenses licence file is missing, not valid or not installed properly, an exception will be thrown:
Unable to find a valid DotNetBrowser Licence. Please make sure you have set up your licence correctly. To do so, follow the instructions here: http://links.teamdev.com/dnb-setup-lic
To get rid of this exception, you should install your valid teamdev.licenses file as described below.
In Solution Explorer, right-click your project and select the Add — Existing Item... menu item:
In the File Open dialog, select D:\Projects\DotNetBrowser\Library\teamdev.licenses and click Add:
In Solution Explorer, right-click teamdev.licenses and select Properties:
In the Properties panel, change Build Action to Embedded Resource: