Since it was noted for 98se and when you bought it, it didn't come with that just pack and return it.
Bob
I just bought a new Brother QL-500 Label Printer, widely advertised
as compatible with 98SE, but now find that Brother has discontinued support for my antiquated OS. Websearches invariably end at a link to
Brother Support site, which, of course, does not provide the software.
XP drivers on the CD do not install on 98SE system. Any advice until I eventually am forced to upgrade to XP?

Chowhound
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