Already purchased

Long, long ago, in a galaxy far, far away.... I purchased a lot of expansions. With a different email, and I don't remember my username or password. Is there any way I can get them again without repurchasing?
The forum for all Redshift games.
http://www.linux.redshift.hu/forums/
http://www.linux.redshift.hu/forums/viewtopic.php?f=3&t=7382