Brian has a Dell PC and after the recent Windows update, he had to reinstall all of his apps. Leo says that's unusual behavior, and it usually comes after a feature update, not a security update. That's why Leo recommends only doing critical security updates, not the optional ones. And it's shenanigans like this that Leo tends to avoid using Windows in favor of Linux. But updating Windows while still using it is a very tricky thing. It's like pulling a table cloth out from under the dishes while eating dinner. Sometimes, it just doesn't work right for a small percentage of people.
Phil updated his Windows 10, but it installed the enterprise version instead. Now he's getting a wrong serial number error. Leo says he could buy it, but that isn't cheap. The easiest thing to do is download the Windows Media Creation Tool and reinstall the consumer version that came with the computer. If he is going to go with Windows Pro, he can just go into the settings under System => Change Product Key and input the pro serial number after the upgrade.