That version may work in 1.04 I used the Sins of Galactic Empire 1.031 version in 1.04, so it may work or not.
The public alpha, for 1.031, won't work with 1.04. The game will load it sure, but half the maps will be missing and the ones that are present won't work, your starting planets will be overthrown immediately by non-existent culture. It's easy to fix this, just need to add a line to each planet file, and fixing gameplay.constants is easy too, though I've already done this in the beta. There will be a public version out sometime this month most likely.