How can I get emails for my 1st degree connections?

In order to capture the email addresses of your 1st-degree contacts, please go to "My Network" and click to see all contacts. 

Or you can simply set up a LinkedIn search and filter your connections by 1st degree.

 Then wait for the list to load and when you see a green popup saying "At your service", click on "Visit profiles" 

Now Dux-Soup will go through the list and record the information about a profile which you can later download.