If I download the Detail list and try to add the proper information in the proper fields (same as I did with the basic) I get the same error:

File Import Completed with issues.
An SQL error has occured. Please check your input data for tabs within fields and delete these. If this error continues, please forward your error log to the Easy Populate maintainer

I am only adding information to the fields I need:

v_products_model: 1
v_products_options_name: Download 1
v_products_options_values_name: Zip 1
v_products_attributes_filename: test.zip
v_products_attributes_maxdays: 90
v_products_attributes_maxcount: 5

Does the entire sheet need to be populated with content? Like 0 in the fields I don't need? This worked perfectly in the Basic list but with no actual zip file to download.

To answer your other question...I'm not sure what you mean by "linked"...if you're asking if I have the zip file attached to the product, no I do not. That's what I hoping to do with this module. I do have the test.zip uploaded into the downloads folders in the back end of my Zen Cart and named the same on the downloaded spreadsheet.