Adds a new mesh object to Blender for quickly creating staircases. Useful for blocking in scenes - or just quickly making a flight of basic stairs without having to fiddle with the Array modifier.
To install, download this archive as a .zip file. Then start blender and open your Edit > Preferences. Select the Add-ons tab and then press the Install button. Browse to the .zip file and select it. Finally, tick the checkbox next to Add Mesh: Curved Stairs Mesh Generator.
This stairs plugin is also being distributed on the Blender market: https://blendermarket.com/products/blender-stairs
A video giving a quick tour of the plugin is available here: