Have the same old problem with the installation. It reaches the end and is finishing but the box does not respond, the cancel button is grey. I have let it run for nearly half and hour and nothing. I also have tried other suggestions that were posted on here but to no avail.
I am reaching the end of my patience with this game and may just return to Civil War Generals which may be out of date and not as cool as this game, but it works on my machine. I have spent several days trying to sort this out.