[PC] DRM-Free XCOM Enemy Unknown Complete Pack (Windows) - $12.29USD(or $16.09AUD) with Wallet Refund @ GOG

I saw this deal while I was browsing through GOG summer sale today before it finishes on 18/06. I have played through Enemy Unknown in Steam and I like it a lot. The complete pack includes the following items
XCOM: Enemy Unknown
XCOM: Enemy Within
XCOM: Enemy Unknown - Elite Soldier Pack
XCOM: Enemy Unknown - Slingshot Pack

I understand there probably was better price on The Complete Pack in the past but all past deals were on Steam platform. The DRM-free deal from GOG means you can download the whole package into your local drive and play it wherever and whenever you like. Alternatively, you can also play it through GOG Galaxy to keep track of stuff like playtime and achievement. It's up to you to decide.

Even better, GOG refunds $2.30USD or $3.00AUD to your GOG wallet that you can use to purchase other games. This brings the actual price down to under $10.00USD. This deal will end together with the Summer Sale in two days and I don't know whether there will be wallet refund or not in its future sale.

One caveat: The current GOG version only supports Windows but not Linux or Mac while the Steam version supports all three. According to the forum discussion, it is probably due to different distributor for the Linux and Mac versions who don't want it DRM-free.