Just download the NSP file, install with Tinfoil or other similar software and you're good to go.
Tested on FW 10.0.2 with SXOS. Works on ATMOS users as well.
Convertion to XCI was not tested.
Changelog:
v2.9 rev.2:
- Now in 60 FPS (switch 30/60 modes)
- New optimization system
- New main camera
- New menu: Gameplay
- Updated save game icons
- New sprite of Super Shadow running
- New animation of big rings and red star ring
- Fixed hyper Sonic and Tails sprite waiting
- Under Ground boss does not kill player when exploding
- Scrambled Egg boss does not lose life with spin dash
- Oil Ocean boss can now be hit in the air
- Option to enable/disable Air Jump
- Change(B) button is used as a back function in the options
- Removed cameras option
- Super animation fix
- Fixed bugs on platforms
- General review of the game by Beta Testers
- Updated credits
2.9:
• Super Button settings
• Smooth camera adjustments on bubble
• Ball grow slower in Aqua Lake Boss
• Time Hill and more zones, optimized for performance
• Mighty and Amy bugs fixes on Don't Destroy challenge
• Smooth/ fixed camera on screen option
• Final support update
• End of letters in version
2.3.D:
• New smooth camera view
• Switch player camera (Smooth / Fixed)
2.2.D:
• New Mighty Jump Dash animation;
• Movement platform, below ground GMZ 3;
• Hidden Cave scenery improvements.
2.1.D:
• Super Button (transform / untransform)
• Press 4x on version to unclock cheats
• Bump on Mighty's spin jump
• Fixes on Amy's hammer drop