ok i bought entrenchment and it is on impulse, installed on my first computer. Now i want to install it on a second computer, so i get the key and enter it under my account on the second computer and it says invalid key or email. But i know the key is right, so on the first compurter's impulse i looked and it doesnt have an email listed for entrenchment, it does for regular sins, so what do i do, or is it even possible to put entrenchment on a second computer.