I bought Entrenchment, but before I installed it I copied my sins directory and then installed Entrenchment. This allowed me to play Entrenchment and Vanilla sins. I've successfully updated Entrenchment, but have failed to update my vanilla sins version to 1.13. I've tried renaming the directories, but Impulse still thinks I have Entrenchment installed and up to date, even though when I ask it to open the application directory, it opens the diretcory for vanilla sins.
I find Impulse intensely frustrating, and I believe Stardock / Ironclad are guilty of putting sales very much first over ease of use for existing users. I think they should do the decent thing and make the updates available in the normal straightforward way, and not thorugh Impulse which just makes it very hard to update.
I feel that having bought Sins and Entrenchment Stardocks / Ironclads policies are defrauding me of legimate updates.