Can't play older versions (Beta/Alpha)

I can't select older versions then release 1.0 since Launcher-Update 1.4.3 (Launcher 1.4.2 worked)

Development Console

[17:06:24 INFO]: Refreshing local version list...
[17:06:24 WARN]: Ignoring: versions/inf-20100618/inf-20100618.json; it has an invalid version specified