your account is not deactived because you have just written your first post since you registrated yourself almost 10 years ago. If your account was deactivated, you could not have written your first post !
But I think you are actually asking why you can not download stuff from the download section anymore. It is probably because you have not donated anything to the forum during the last year. You can donate here:
http://www.yu-midi.org/forum/misc.php?do=donate