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Just wondering, but those Dow1 and 2 Collections, do you need to be online to play skirmish vs Ai opponents, or just if you want to play versus other players?
skirmish work offline.

As for DoW2 downgrade patch... There is such warez repacks based on old games. Same for GTA4Complete. DoW1 are easier - it was DRMfree some time before Steam. DoW2 always be GFWL or Steam+GFWL.