Campaign Manager is only necessary for patches that update files based on the date. The WFP *HAS* to do this, but most other patches will work fine without using CM - the date based changes just won't happen, but they aren't critical. Patches like RotJ, Beery and Wingstrut (and the new 1918 AW) have a seperate date component you can use if you want to.
Rob
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Cpt Mahoney, RFC 266