SEP 12.1 RU6 MP3~MP6はWindows 10 Anniversary Update には対応出来ていないのでしょうか？
インストール時にエラーが出てしまします。
look at this thread.
https://www.symantec.com/connect/forums/does-sep-1216mp5-work-windows-10-anniversary-edition
Not officially supported but here is a response from Symantec:
https://www.symantec.com/connect/forums/does-sep-1216mp5-work-windows-10-anniversary-edition#comment-11659791
Symantec Endpoint Protection support for Windows 10 Anniversary Update
You need to already be on 12.1.6 MP5 to have a successful transition to the Anniversary Update.
Symantec Endpoint Protection 12.1 RU6 MP5 offers basic compatibility with Windows 10 Anniversary Update.
There is a Knowledge Base Article that contains additional detail around what is available with 12.1 RU6 MP5:
https://support.symantec.com/en_US/article.TECH235458.html