Description A problem was found in the original release of .:CATALYST:. v1.2, this download will give you the fixed levels only, this is not a stand alone mappack! You must have the first release of .:CATALYST:. v1.2 inatalled on your system; Once .:CATALYST:. [A problem was found in the original release of .:CATALYST:. v1.2, this download will give you the fixed levels only, this is not a stand alone mappack! You must have the first release of .:CATALYST:. v1.2 inatalled on your system.