Lanty,
Checked your account, seems all 3 parts of GalCiv II are listed on the same account, along with a copy of Sins. If your having issue with e-mail, try this;
Make sure that Impulse has the correct log in info;
Click on the blue Stardock logo, and from the flyout menu choose 'Change Log-in...'. Make sure that Account Name shows 'E-MAIL HERE', and re-enter your Password, 'PASSWORD'.