if you encounter the error where it says "missing d3d (blah blah) and/or other dlls" this is the fix:
most likely this error has to with wrong directory paths...
right click entrenchment in impulse and open the application folder. if this folder differs from the root "My Games"-folder (set the folder in the preferences option in stardock) it won't work.
manual edit: run "regedit" go to HKLM -> Software / Stardock / Drengin.net / sinsentrenc there set the path to the original one C:\Program Files\ Stardock Games\ Sins of a Solar Empir\
impulse again and click the install button of entrenchement again.
fixed this error at a friends entrenchment install using this procedure!