looks like the new SEP 12.1 RU6 MP2 carries some fixes fro win 10.
After an upgrade to 12.1.6MP1or later, an upgrade to Windows
10 prompts you to uninstall Symantec Endpoint Protection
(3806157)
If you upgrade Symantec Endpoint Protection from 12.1.5 or earlier to 12.1.6 MP1,
12.1.6 MP1a, or 12.1.6 MP2, and then immediately begin an upgrade to Windows
10, you may see an error message that you must first uninstall Symantec Endpoint
Protection. This issue occurs because additional Symantec Endpoint Protection
upgrade processes have not completed. Therefore, the Windows upgrade detects
product files from an earlier Symantec Endpoint Protection version that does not
support Windows 10.
To prevent this issue, do one of the following tasks before you upgrade the operating
system to Windows 10:
■ Uninstall the earlier version of Symantec Endpoint Protection.
■ Upgrade Symantec Endpoint Protection to 12.1.6 MP1 or later using the following
command-line switches:
setup /v"l*v c:\log.txt MIGRATIONDELAY=1 MAXMIGRATIONDELAY=1"
■ If you already upgraded to 12.1.6 MP1 or later, check the file roru.log to verify
the completion of the upgrade. The last line in the log should display the date
and time, and the word "Finished."
Release notes 7
Known issues and workarounds
You can locate this file by default in \ProgramData\Symantec\Symantec Endpoint
Protection\CurrentVersion\Data\Install\Logs\ (for Windows XP: \Documents and
Settings\All Users\Application Data\Symantec\Symantec Endpoint
Protection\CurrentVersion\Data\Install\Logs\).
If you encounter this message, do not uninstall Symantec Endpoint Protection as
prompted. Instead, cancel the Windows 10 upgrade. Check the file roru.log as
previously indicated, and when the upgrade processes complete, begin the Windows
10 upgrade again.