This thread is where you can download the most recent version of the official Saints Row modding SDK. Release B enables you to make all kinds of customization items for Saints Row IV.*
Additionally, Volition agreed to provide the modding community with a plethora of 3d assets, featuring not only clothes and hairstyles, but also NPC models. Those will be available to download here in the near future.
It’s been an honor to work on this. Now it’s your turn, go make something cool!
NOTE: You need to download a few external tools to run the SDK, visit one of the SDK related tutorials linked below in order to download them.
DOWNLOADS
SRIV SDK Release B revision 2
Updates:
Revision 1: initial release.
Revision 2: fixes the bind pose in the female template file.
Revision 3: prevents the converter from crashing if there are more than four bone influences on any given vert.
Revision 4: changes the way the script processes orders to get more reliable results.
SR3 / SRIV Weapon Archive
TUTORIALS
SRIV SDK: Adding new Customization Items
SRIV SDK: Modifying Weapon Costumes**
Steam Workshop Sub-Forum
*Note that hairstyles are currently not fully supported by the modding patch. However, that’s probably going to change sooner, rather than later.
**Using this SDK release in combination with the modding patch also makes it possible to add new weapon models to Saints Row IV without replacing existing ones, but the tutorial hasn’t been updated yet.
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Thanks for your hard work 
