This Key is suitable?

[hensaru44]

Hey Guys, I'm planning to order PS (the original), because it's cheaper for me.
I used the 7-day trial.. and I think it has the core combat expansion. My question is: can i use the original PS key with this client I downloaded?

Can anyone confirm if the 7-day trial version has core combat? I know I can't command BFRs.. but I can use air bombers (isn't that the liberator?) and ATV.