1. Download the curve_beautifier.zip file.
2. In Blender, navigate to Edit > Preferences > Add-ons
3. Click Install, and find where you downloaded the zip file. Then hit the Install Add-on button.
4. In the sidebar panel, (shortcut key N), you will see CurveBF, click on it.

Change Log:

• Version 1.0.1: Fixed issues with mirror points on Blender 4.4x. Added support for mirroring along the z-axis.
  
• Version 1.0.0: Initial release.