Every version of the packages are build for a specific version of the mod and a specific version of Minecraft, also Forge is a factor. Therefore not all packages can operate with all mod versions.

• Package version 1.5.2a -> Minecraft 1.5.2 -> Flans Mod 2.3.1
• Package version 1.5.2b -> Minecraft 1.5.2 -> Flans Mod 2.3.2
• Package version 1.6.2a -> Minecraft 1.6.2 -> Flans Mod 2.4.1