Update from Sierra to High Sierra - Crossed circle

https://i.imgur.com/UI5eN5H.jpg

The image above is the last thing I can see after the update is in process but unsuccessfull. I did everything by the guide here: https://www.tonymacx86.com/threads/update-directly-to-macos-high-sierra.232707/ ...

The last readable thing I could catch is this, but I have no idea what's wrong there or what could lead to installation issue: https://i.imgur.com/Cccjwod.jpg

Old sierra installation is working just fine, problem is only with updating. Thank you for any suggestions guys.

submitted by /u/TheSmexhy
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