Following KB000041041: EEM 12.x Uninstall and Cleanup. The old version of EEM needs to be uninstalled as it was 32
bit and the new 12.6, which is 64 bit installed.
Installing EEM 12.6 in Windows 2008 ( on Common Components media) fails with the following message in the eiam-install.log
Uninstalling, removing folders, registry entries and re-installing did not help, the same message occurred.
28 Aug 2018 13:33:02 INFO DXServer - The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail.
28 Aug 2018 13:33:02 INFO DXServer - Command [dxserver install itechpoz] exit code 
28 Aug 2018 13:33:02 ERROR DXServer - Command [dxserver install itechpoz] failed with error code 
28 Aug 2018 13:33:02 FATAL ConfigureCADirectoryAction - CA Directory configuration failed
java.io.IOException: Command [dxserver install itechpoz] failed with error code 
at com.zerog.ia.installer.actions.CustomAction.installSelf(Unknown Source)
Windows sxstrace shows:
ERROR: Cannot resolve reference Microsoft.VC90.CRT,processorArchitecture="amd64",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.21022.8".
ERROR: Activation Context generation failed.
End Activation Context Generation.
( This is referring to an old Visual Basic Package)
After un-installing and re-installing the old Visual Basic Package, the EEM install was successful.