I appreciate your offer, but I have to decline. If you're not distributing the raw animation clips, you're free to use them in your VRChat addon.
MasterPuppet
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You'd have to have Unity installed to unpack a Unitypackage, with Unity installed have a Project open and double click on the package and it should import the files to Unity. I don't know if there's Unitypackage converter for Cinema4d, I've heard there's one for Godot, but I don't know much more than that.
Yes, you would have to purchase the pack to access the FBX files, I don't know anything about Cinema4d, so I don't know how well this pack will work, as it's intended for Unity and Exported from Unity, and I don't know how the FBX files will be read in Cinema4d. I made the FBX files mostly for people that use Unreal Engine, and from what I heard from people that tried it, some got it to work, while others haven't.
As mentioned before, I don't use Unreal so most of my knowledge on Unreal is second hand, but this is all I can give you regarding that error, I hope this can help you fix it:
https://forums.unrealengine.com/t/mesh-contains-root-bone-as-root-but-animation-...
https://forums.unrealengine.com/t/error-mesh-contains-hips-bone-as-root-but-anim...
I didn't include models because the models used are not mine. Are you sure you can't retarget the animation to another model in Unreal? I can't really test it in Unreal as I don't use it, but from what I've seen and heard online you can retarget an FBX animation Rig to another model in Unreal using a T-pose.
I found this online let me know if this helps or if you need anything else: https://docs.unrealengine.com/4.27/en-US/AnimatingObjects/SkeletalMeshAnimation/...
I found these things on the errors, I don't really understand Unreal, so I hope this can help you.
https://forums.unrealengine.com/t/importing-animated-fxb-always-fails/22729
Unfortunately, I don't use Unreal, but if you just need a Tpose I can add that for you, the animations were exported from Unity, so I don't know if I could give you a source file, but other than the Tpose, I don't know how much help I'll be with Unreal as I don't know much on how the Animation System works, but feel free to ask me if you think I might be able to help.