my project in visual studio needs Sitecore.EmailCampaign reference but I can not find its .dll file on the Internet.
So I'd like to know where and how to download Sitecore.EmailCampaign and than install it to Sitecore. I've heard that in order to add this reference, we have to attach Email Experience Manager (EXM) to our sitecore instance. I also tried to watch some Youtube videos but they do not show how to import EXM.
Here is what I've read before: https://doc.sitecore.net/email_experience_manager/getting_started_with_exm/email_campaigns/create_an_email_campaign