When it comes to my PCs, Linux Mint is my operating system of choice – it is fast, reliable and easy to use, while retaining Linux’s power in terms of configuration and customization. I just found out that HDTracks does not have an official HDTracks Downloader for Linux: there is, however, an alternative which actually works.
JRiver, maker of the media center software by the same name, has got an unofficial Linux version of the HDTracks Downloader. It is very simple and basic, but it gets the job done and that is, I think, the whole point, since there is no other way I know to get the tracks on Linux.
The package is available as a .deb file, which means it can be easily installed on Debian-like systems (e.g. Debian, Ubuntu, Linux Mint, Kubuntu, ecc). Those on other distributions will need to perform a conversion, which is usually painlessly carried through by various available tools (e.g. Alien).
You can download the package here. Once downloaded and installed, you are just required to enter your HDTracks account details (email address and password) and the software will take care of downloading the files.
The downloader will fetch files as set in your profile – either FLAC, ALAC, AIFF or WAV.