Thank you for your help. I have just a handful of linked products of about 18K products.

I went to User Defined Products Fields field in admin->configuration->Easy Populate 4 and entered the field name master_categories_id. When I went back to easy populate I noticed a new file 210 in size called Values-EP2015Mar08-084448.csv.

When I download Complete Products (with Metatags) I get the message "an error occurred while processing this directive". Tried to reload and I have 2 different size easy populate files. I am guessing that is because of the file size.

The Export URI with Prod and or Cat setting worked great! I was able to download the text file with URLs.