Hi Dan,
Sadly, many vendors, (as opposed tae manufacturers) will sell older stock as "Win10 compatible/upgradeable". Which saves them the time and subsequent manpower costs needed tae do the updates they should... thus leaving it tae the consumer. That's when the problems occur. It's usually smaller vendors (online) with stock tae shift who are the culprits. Normally a local high street vendor could not risk the damage tae his/her reputation. So buy from a reputable online or local high street vendor.