4 Reasons Why Cannot Upgrade To Windows 8.1
You may upgrade to Windows 8.1 through Windows Update or the Windows Store, or download Windows 8.1 Update Package KB2871839. But when checking your system doesn’t change to Windows 8.1, I have to tell you that you cannot upgrade to Windows 8.1 right now.
According to Microsoft, there are 4 reasons why you cannot upgrade to Windows 8.1, at least right now:
1. Your PC was not installed the update KB2871389
2. You are using Windows 8 Enterprise
3. You are using Windows 8 Pro is activated by using KMS method
4. You are using the Windows 8 ISO installed file provided by MSDN and is active with the MAK key (multiple activation keys).