This a dolled up version of one of the scenarios from Stupor Mundi and not a BRP version of a standalone product as description implies.
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"This adventure was originally published for the Mongoose Edition of RuneQuest. If you own the original edition, you will probably not need this version."
The description clearly states that it is a re-hash of a previously published product, and goes as far as warning the customer that he might find it useless if he owns the previous edition. We feel we have done our best to make things clear to any potential purchasers here.