Hello there!
It seems like some questions that have been asked have already been provided answers. I'll do my best to provide some additional clarity here.
The Location of the Armory
As shared by @TheNorfolkian, you can find the tent where you build the armory next to the River Raid docks.
Ymir's Scream Tattoos
It looks like some parts of the Ymir's Scream tattoo set, such as the arms and face, were missing in-game. These have now been added into the game following the release of TU 1.5.2. I've reached out to our dedicated teams to see if we can get more information about this. Once we have more details to share, we'll let you know within the forums.
Download Size
As advised by @SpirantCrayon22, the download size is only an estimate (as marked by the ~ symbol). I can see on the patch notes that TU 1.5.2 should have been ~7.8GB, though it may have been smaller than this upon its actual release. I can assure you that there is nothing to be concerned about in this case. Should the update size be drastically smaller / larger than the estimate, then please don't hesitate to let us know!
Duplicate Dwarven Hair
I can see you've opened up another thread for this issue, @XBL_Laberbacke. A member of the Player Support team will be in touch as soon as they're able to.
Guaranteed Assassination Reset
Would you be able to create a new thread regarding this issue, @XBL_Laberbacke? We can then look into this further without going off-topic within this thread.
I hope I've been able to provide some answers for the questions posed within this thread. If you have encountered any other issues following the release of TU 1.5.2, please can you create a new thread so we can look into this further? Having a separate thread for each unique issue is helpful when gathering more information, tracking the issue, and providing updates.
Thanks!