Here I will link all blog posts related to Windows 10 troubleshooting issued, that I've postet. A 2nd ressource is my German Windows 10 Wiki/FAQ – that contains far more articles – especially about Windows 10 upgrade issues. Also the english Wiki How to: Troubleshoot common Setup and Stop Errors during Windows 10 Installation (extended German edition here) from my MVP collegue Andre da Costa may be helpful.
Tips and hints
Windows 10: Open command prompt window as administrator
Trick: How to upgrade to Windows 10 using a clean install
Microsoft Windows and Office ISO download tool
Windows 10 Version 1511 via Media Creation Tool "is back"
Update KB3173040 – end of free upgrade offer notification
In case of issues, I recommend, to run a system check like it is discussed below and in KB947821.
Check and repair Windows system files and component store
Windows: Yes button in user account controls is disabled
Windows 10: file system error (-1073741819) – 'extended attributes are inconsistent'
How to fix Windows-Setup Hard Disk locked error
Windows: UAC opens hidden in background
Windows 10: Volume control is missing
Windows 10: Error 0x800704CF
Windows 10: Upgrade error 80240020
Windows 10: Upgrade error 0x80200013
Windows 10: Upgrade error 0x80070570-0x2000C
Windows 10: Upgrade error 0x8007002C-0x4000D
Windows 10: Upgrade error 0xC1900101 – 0x20003
Windows 10: Upgrade error 0xC1900101 – 0x20004
Windows 10: Upgrade error 0xC1900101-0x2000A
Windows 10: Upgrade error 0xC1900101-0×20017/0×30017
Windows 10: Upgrade error 0xC1900101-0x2000C
Windows 10 Anniversary Update: Upgrade error 0xA0000400
Windows 10: Upgrade error 0x8007001F
Windows 10: Update error 0x80070057
Windows 10: Error 0x80070057 from Cloudfogger
Windows 10: How to fix update error 0x80080008
Windows 10 Anniversary Update (Version 1607)
Windows 10 Anniversary Update rollout explained
PSA: Windows 10 Anniversary Update gives just 10 days for rollback
Windows 10: Rollback to Windows 8.1 is 'missing'
Virtual PC 2007 blocks Windows 10 Anniversary Update install
Windows 10 Anniversary Update kills Cortana (Fix)
Windows 10, Version 1607: driver signing changes
Cortana search in Windows 10 Version 1607 – a 2nd look
Microsoft axes Group Policies in Windows 10 Pro version 1607