As the title reads. you might think of me as dumb for this, but actually, ForgeMultipart for 1.10.2 is out! thus, that's what this used before... check it out here, in the chickenbones downloads.
thanks for reading and keep up the good work!

I checked the link. It's under "Latest" but is not under "Recommended" so I assume it's in alpha or beta still.

It's also looks like a separate mod and isn't actually associated with Forge, so it's on the same ground as MCMultipart. In fact, MCMultipart was going to be merged into Forge a few months ago, but that was cancelled for some reason.

Everyone who is using multipart stuff is already using MCMultipart, so I don't see any reason to switch at this point.