Just chiming in here. Kudos to Human Kthulu, for getting this off the ground and a working reality. However, we are into the realm of "abandoned mod" (though we aren't really, because Solarius Scorch as done a great job of carrying the Torch and keeping it alive).
I think in cases like these (Abandoned Mods), it makes sense to re-work the Opening Post so that it best reflects and supports the currently supported version of the mod. It helps that you (Solarius) have moderator powers and can do this. I would go so far as to support changing the ownership of Opening Posts in situations like this. In this case, you could compromise and put HK's original post in spoilers, and rework the post.
An alternative is retiring the original thread, and starting a new one with the new owner. An "(ARCHIVE)" tag might be enough to flag it as out of date, and allow the new one to carry in the current build).
Unfortunately, this situation is somewhat of a hazard of a community like this, as the human landscape varies according to people's interests and availability. Not everyone can be a Hobbes.