In Enterprise or Basic Advertiser Accounts:

Login to your OPTIZMO account directly > Select Opt-Out Lists from the top menu bar (You should see all of your lists) > Click on your chosen list you need to pull data from (This will take you to the List Profile page for that list) > Hover your cursor over the blue drop-down menu at the top-right of the screen > Select Download List > In the Filters box and Options boxes, specify any parameters you wish > after selecting/inputting filters, Click the Download List button at the bottom and you are done. 

In Network accounts:

Select Advertisers (you will have a list of all of your Advertisers) > hover over the name of the Advertiser whose list you need to extract from, and click Show Opt-Out Lists (you will have a list of all lists under that Advertiser) > click on the name of the list you wish to extract from (This will take you to the List Profile page for that list) > Hover your cursor over the blue drop-down menu at the top-right of the screen > Select Download List > In the Filters box and Options boxes, specify any parameters you wish > after selecting/inputting filters, Click the Download List button at the bottom and you are done.  

Note: In a Network account, this function is not available in a Linked List.