If you have a W98 disk, all you need to do is "show" that disk to the computer during the installation of your new XP.
If you don't have access to a W98 disk then, yes, you have bought the wrong version.
Hands-on: Acer Predator Triton 700 review
D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
How to lose weight with an Apple Watch