4.0

Note:
This tool is just for packing NCAs into NSP and it doesn't touch NCAs (if they don't run, it's not this tool's fault, just NCAs don't pass switch checks or they are corrupted)

Thanks to @lunalik2 for the .exe files (for people without Python) (#5)

Thanks to @roothorick for making nspBuild usable in scripts. (#3)

Python 2 is faster by ~20% thanks to @shchmue . (#2)

2.0

The way to install NSPs is to use DevMenu. You need signature patches which you can see how to get from here:

https://pastebin.com/raw/ht9dfcSU

Python 2 is faster by ~20% thanks to Shchmue.

3.0 Beta

Note:
This tool is just for packing NCAs into NSP and it doesn't touch NCAs (if they don't run, it's not this tool's fault, just NCAs don't pass switch checks or they are corrupted)

Thanks to @roothorick for making nspBuild usable in scripts. (#3)

Python 2 is faster by ~20% thanks to @shchmue . (#2)

Python 2 (with help from shchmue)

Thanks, shchmue for porting to Python 2! This version is ~20% faster. Still working out the Not installing bug though.

Python 3

Drag & drop XCI or NCA on this (you need python so get it here: https://www.python.org/downloads/) and type (filename.nsp) and install it with dev menu.