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I thought Darkest Hour was HOI2?
 
How do I d/l the 1.03 patch???? I click on the d/l link and I'm sent here. wtf?
Your vendor has a wrong link. DH shares neither the name, the engine nor the developer with this game.
Go here for the correct link: http://forum.paradoxplaza.com/forum/showthread.php?635575-Darkest-Hour-Patch-1.03-Hot-fixes

If you just downloaded/installed DH it should be on the 1.03 patch by default.
Only if it's Steam. Their competitors rarely ship updated installers.