1) To exchange theme you need to buy XStore license for this project. After that go to https://themeforest.net/refund_requests/new and submit refund request for the WooPress license that you use for this project and provide purchase code of the XStore theme that you just bought. We’ll be able to check your purchase and give refund for the WooPress.
2) What version of XStore do you use on that site? The latest version of XStore includes header builder and multiple headers option. Using this feature you can choose categories, pages https://www.youtube.com/watch?v=BpeXfzNwkOc&feature=youtu.be
