Does the game need to be installed from the disk or is there a download option? My laptop does not have an optical drive.

It is activated on Steam so I would assume you can enter the code in the box to activate and then download it. I know that I installed it originally from the disc but since then it shows up as one of my games in my library on Steam that I can install via download.

Is it compatible with Windows 10?

Yes I have been using it on Win10 Pro

Questions & Answers: XCOM: Enemy Unknown - The Complete Edition PC Game

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XCOM: Enemy Unknown - The Complete Edition PC Game

Includes XCOM: Enemy Unknown, XCOM: Enemy Within, Elite Soldier Pack add-on content, Slingshot add-on content, Second Wave add-on content
Strategic Base: Detect and intercept the alien threat as you build and expand your XCOM headquarters. Recruit, customize and develop unique operatives, manage your personnel, and negotiate with governments around the world
Tactical Combat: Direct your squad in fierce turn-based ground battles, engage in covert operations, and rescue civilians in crowded cities and desolate outlands around the globe
Research Alien Technology: Recruit scientists and engineers to unlock more advanced weapons, armor and abilities
Multiplayer: Mix and match aliens and humans. Combine abilities to outsmart and overpower your opponent in intense, one-on-one, turn-based matches

$21^.99 –