First off save your game.
Go to your storage(HardDrive or MU)
go to the bottom and click on the "Title update" on your Skyrim saves.
Delete it and then go back into game.
It will ask if you want to DL it again, click cancel.
Load your game, make sure not to continue or it will freeze.
Now smith your iron daggers as much as you want.
If this guide wasn't helpful, just google it or search it on youtube