How can I port a Yes Steve Model to R15?

I want to port a Yes Steve mod character to Roblox.

This is the link to the Model in ZIP format.
https://www.patreon.com/posts/ysm-model-gun-1-146700212

Preferably, it would use an R15 armature.

The issue is that I don’t know how to do things like bring the .ysm files into Blender to rig them to the Roblox schema. That is all, I can do the rest of it, like retargeting.

I have tried looking for how to get the models and animations out, yet haven’t found anything.

Thank you.

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