Hm, Mod Center on wot site seems to offer the pack in 1.5.0.4 version, while the pack itself is not updated (getting the error "game version unsupported, pack for 1.5.0.3 only"). Does the number increment automatically there without actual update? Confusing, if so.
(I am aware that if this site here does not offer 1.5.0.4 pack yet, it's most obvious assumption the author hasn't launched 1.5.0.4 yet at all).