I'd also be interested in knowing this, I tried installing the latest version of the plugin to 5.3 and I got an error that it couldn't be compiled which was frustrating. It was just a fresh project so I haven't lost much work and can migrate to 5.2 easily but it's still annoying.

Looking for the 5.3 update myself, kinda can't move forward with my project now I have moved everything over to Unreal 5.3

When will the Auto Setup Plugin be released for the new UE version 5.3?
I tried to upgrade my unreal project to 5.3 (without the plugin) and the skeleton seems to be broken. I think the plugin will fix this issue.
Did anyone else experienced this issue?