SEP v. 12.1.7004.6500 not installing on Windows 10 Prof v18.03. I keep getting an error stating that this operating system is not supported. I have installed it on previous versions of Windows 10 with no problem. Any suggestions? Thanks in advance!
Redstone (1803) was just supported in the last release:
https://www.symantec.com/docs/TECH235458
You need to install 12.1 RU6 MP9. The version you're trying to install is not supported on Redstone.