We try and release at ~1pm EST whenever possible. Not 100%, but more likely than any other hour of the day.
To attempt to make sure there aren't potential problems for people who had earlier betas and didn't uninstall for beta3, everyone with an Entrenchment beta is getting prompted to uninstall.
That said...
If you're 100% sure you're good from the beta 3 update and want to try and get just the Entrenchment files (and the 1.15 update), delete your beta Sins of a Solar Empire Entrenchment.exe, the Entrenchment subdir, and HKEY_LOCAL_MACHINE\SOFTWARE\Stardock\Drengin.net\sinsentrench. Then install Entrenchment 1.00.xxx from Impulse.
It'll prompt you to update the base Sins installation at the same time.
Kris