Of course, as this game was never released. You bought a fake original created by the seller (or the person the seller got it initially from). As you can see from the linked threads above earok (member of this forum) created a cd32 iso. This may well be what you have bought.
The question is: Did you know that you bought a fake original ?
This also answers your initial question: As it was never released for the Amiga you won't find an Amiga manual for it.
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