The download buttons on the site link directly to the Soundpaint app and its downloader, so you will want to make sure you have both apps installed before selecting the library download option on the Soundpaint website. If these apps are not installed, the download buttons on the site will not work. You can download Soundpaint from the Engine tab of your account page.
A full setup tutorial can be found here:
If you need any help downloading your libraries, please reach out to us through our live chat or at support@soundpaint.com.