You can download both from steam.
The High res pack is found by right clicking on skyrim, selecting view DLC. Then clicking on the link saying view dlc for this product.
The texture pack is 3.2GB but its hosted on my ISP's steam content server.
The creation kit is found under library and then selecting tools from the drop down menu.
The Steam workshop page for Skyrim can be found here:
Today is a good day to be a PC gamer.