Hi, diagnosing upgrade failures can take days and often without success. Other than it being something simple or matching an already resolved case you can identify, there is nothing truly diagnostic which will help you. Plenty of example cases on tenforums.
See my suggestion on clean installing at the end.
That said:
Have you been offered Win 10 via Windows Update? If not, MS deems your hardware/drivers/software incompatible.
Put another way, how did you try to upgrade?
Dell Inspiron 560 - is from around 2011. Thus it is unsupported and not specified for Win 10. Upgrading is at your own risk. Millions do it, some have problems.
Have you checked to see if there are any reports of people running Win 10 on this?
Current build issues:
Known and Resolved issues for Windows 10 May 2020 Update version 2004
It's recently been released, and some bugs are known. I prefer to wait until the first major update after a new build release.
If you care to read this:
Upgrade to Windows 10
- in particular this section:
there are links to pages with more links telling where the log files are and a starter on what error numbers and messages mean.
Preparing to upgrade: standard recommendations are:
- uninstall any security software
- check you have at least 30Gb free on C:
- disconnect any unnecessary hardware
- have only your system disk connected
Basic checks:
Check your disk: HD Tune v2.55 (free) Health and error scan tabs
If ok from an admin command prompt run
chkdsk c: /scan
If ok from an admin command prompt run
SFC /SCANNOW
Post back if any fail.
Regarding
The installation failed in the Safe_OS phase with an error during the Replicate_OC Operation
I searched for
Windows upgrade phases: see
https://docs.microsoft.com/en-us/win...upgrade-errors
More information in the various error logs.
Post a screenshot of your partitions using a 3rd party partition manager.
==========================================================
I note you might consider a clean install.
You don't have to clean install Win 7 first. You can clean install Win 10 directly using your Win 7 key.
Clean Install Windows 10 Directly without having to Upgrade First
Suggestion:
Rather than wipe your Win 7 installation, as an experiment to check there are no other contentions, remove your existing system disk, put in a spare/new disk, and then try installing Win 10, to see if it succeeds. That way you should be safe.