You can grab older versions at bottom of main page :
LunaticRave 2 Official Site
(beta2 081115 ƒtƒ‹ƒZƒbƒg
beta2 081115 ƒAƒbƒvƒf[ƒg•
beta2 081005 ƒtƒ‹ƒZƒbƒg)
Also, I confirm Lunatic Troopers doesn't work on the latest beta, not tried the old versions yet.