This who obtained key for Delphi 7 Personal when it was free and available can use software in copyrights terms.
Others have only chance to buy sealed old or rewrite program in newer version;)
does anyone know a free (and legal) way to compile Freetrack?
You can try to compile that on any university which has a program for student use. Freetrack is a noncommercial project so you can compile it there.