7000

I’ll see if I can reproduce the issue. For now, could you verify that you downloaded the correct Simple Dual Sheath version? Both downloads were obtusely given the same version number in the Nexus page. Also, any chance you’re using the Comprehensive Attack Speed Patch? This was noted to prevent Simple Dual Sheath interface from loading for a user on Nexus.

Are you using the full version of XPMSSE? It's not compatible with Weapon Styles IED.