A fully opensource SX Core / Lite compatible firmware that lets you play a Space Invaders inspired mini-game and load any payload you like.

No, it doesn't. You can't even boot into Horizon OS using Spacecraft-NX by itself.

No, it can't. This firmware doesn't have their DRM.

To do that you need a firmware like Atmosphère and a bootloader like hekate or fusée.

If the payload is updated to support patched erista or/and mariko chips: yes

If the payload is only RCM compatible: you need to ask the developer for update.

For now you can't flash Spacecraft-NX without pluging in your modchip into your pc.

• Plug in your USB dongle into the modchip.
• Plug in your micro-usb cable into the dongle.
• Plug in the other end of the cable to your Windows PC. (Linux support is work in progress. Feel free to send in a PR for OS X)
• Download the latest release.
• Unpack the archive
• Double click the flash.bat DO NOT UNPLUG THE USB CABLE IN THE MIDDLE OF FLASHING OR YOU BRICK THE CHIP
• Wait till it says !!!DONE!!!
• Copy the payload into the root of the sdcard and rename it to payload.bin
• On the first boot up your chip will enter into a training session, blinking yellow. This may take up to 30 minutes. (Recommended to plug in a charger)
• After the initial training the chip will blink magenta and turn green upon successful boot up.

Don't worry. Windows still installing the drivers.

Calm down and try again.