Why the shopping cart is still continue through to the checkout page even though I do not select any of checkboxes I specified earlier in the attributes for a downloadable free product?
Why the shopping cart is still continue through to the checkout page even though I do not select any of checkboxes I specified earlier in the attributes for a downloadable free product?
If none of the checkboxes are "required" attributes, you'd wind up in that state.
What features are you using the checkboxes to identify? If they're specifying a type of download, e.g. .zip vs. .doc file extensions, a radio-button type of attribute might work better.