Addon is also available for free on my Gumroad store:

https://amanbairwal.gumroad.com/

Please don't mind if the page sounds pretentious or like a sales pitch; it was written by ChatGPT 😭

Are you frustrated by the recent changes to how Auto Smooth operates in Blender 4.1? If so, you're not alone. Personally, I found the new system lacking, which prompted me to create a solution.

Introducing the Old Auto Smooth Add-On for Blender. Made to mimic the behavior of previous Blender versions, this add-on presents a familiar interface and ensures the new auto smooth modifier automatically stays at the bottom of the stack at all times. 

Please note that this add-on is considered experimental (Alpha-Beta, or whatever term you prefer) as I haven't had extensive time for testing. However, I'm eager to share what I've developed. If you encounter any issues, don't hesitate to contact me via Discord or email.

Here's how to use the add-on:

1. After installing the add-on, locate the old 'Normals' panel in the Object Data tab within the Properties area.

2. Here, you can toggle auto smooth ON/OFF and adjust the auto smooth angle. The add-on will manage the auto smooth modifier in the background automatically.

3. Alternatively, you can right-click in the viewport and select "Shade Smooth by Angle (OAS)" to achieve the same effect, akin to using Shade Smooth or Shade Flat.

For feedback and queries contact blenderrantools@gmail.com

or join the Discord Server:

https://discord.gg/PgtZ33ePw7