So we buy our pc's from local retailers, they come with windows 10 home. For the life of me I can't upgrade them, well I can only do 10. So the way to do it is through the store with your ms account, but it only allows 10 upgrades???? I have to degrade someone to upgrade another? I can order the OEM disc, but there has to be a way to upgrade more than 10 pcs from windows home to pro.