Ok, this is my first fix since I became an FA. I was wondering when it would happen. Not IF, but WHEN, since I try so many new things that I often mess up everything. But until now I was so lucky to be able to clean up everything before release or to hide the proof under the rug.

This time someone told me that pets weren't able to use the staircases. After some investigation I discovered that it was completely my fault (well, I knew it even before investigating).
I don't play so much with pets, and when I play, I keep everything they need on first floor. So I didn't realize that they have four legs instead of two and that they need more space than Sims to use the stairs.

The good news is that I've fixed the problem and updated the stairs. Both meshes will be free to download for a few days starting from tomorrow, just in case your subscription has expired. Please download them again and overwrite the old ones. The links to get to them fast are:

Curved Staircase - MASTER MESH
Curved Staircase - RIGHT MESH

Thanks to dmt1914 for letting me know of the problem.