The Enable Free Download for Subvert Members toggle lets you offer your release as a free download exclusively to co-op members, while keeping a standard price for everyone else.
This is separate from setting a member price. When this toggle is on, signed-in co-op members can download your release at no cost. Non-members still see and pay the standard price.
This toggle is off by default. You can turn it on or off at any time through your release editor.