Windows 8.1 Pro won't upgrade to Windows 10 Pro?
31261
Prevent Windows 10 installer from using the preinstalled serial key without disabling UEFI
19288
Update manager doesn't offer an upgrade to the new release
36935
Windows 8.1 Upgrade fails with error code 0x80070652
157071
Registry key / GPO to disable and block Windows 10 upgrade?
1520
How to install software or upgrade from an old unsupported release?
12614
Upgrade problem
30663
Non-destructive upgrade from Windows 10 Pro to Windows 10 Enterprise?
88438
Windows 10 upgrade kills grub and boot-repair doesn't help
28040
Windows 8 Upgrade Failed - No Error Info
20193
Windows 10 non-persistent installation (live ISO)
5016
Unable to install .NET 3.5 on Windows 8.1
52742
How to cancel updates in Windows 10?
45865
Windows 8 Pro clean install - everything slow; hard drive at constantly at 100%
40933
Will Windows 10 Technical Preview be upgradable to final release?
30336
Windows 7 SP1 Windows Update stuck checking for updates
146496
Can I acquire a Windows 8.1 licence by free upgrade from 7 to 10, then downgrading
120337
Is it possible to get Windows 10 upgrade as an ISO image (to make a bootable install disk from)?