Hi,

my Upgrade from 8.0 to 8.1 pro has failed and i don't know why.

Where can i see the reason? Where is the log?

Annoying...

thanks

Hi,

Before upgrade to Windows 8.1, please first install all available updates including system and Modern app.

Then, make sure that the 3rd part security application is removed, since it will sometimes cause the updates issue.

If there is any external device plugged in your computer, please unplug it. Another thing is that lets connect the internet via wired connection.

Then, try to install it again.

In addition, if we still fail to install Windows 8.1, please collect following logs and upload here for further research:

setuperr.log and setupact.log under C:\Windows\Logs\PBR\PreRollbackLogs\ and C:\WINDOWS\PANTHER\

Keep post.