Hi,
Are you talking about the download links for free products, the link in the download page, or the “buy now” buttons?
– If you are talking about the download links for free products, you should edit the: “ms-download-link” class in any of the CSS files used in your webpage.
– The style of the download links to the purchased songs in the download page, are inherited from the active theme.
– The images of buttons: “Buy Now”, “Add to Cart”, etc. are stored in the location: “/wp-content/plugins/music-store/paypal_buttons/”, you simply should replace the image.
Best regards.