Using steam game key without steam installation

I want to play Heroes 5 on my ubuntu 13.04. I installed steam and it works. I have purchased the Might and Magic 5 bundle, so I have Heroes 5 with the two expansions and other game that come along. But when I select Heroes 5 item from the install list, it says, you cannot install this game on your platform. It means you cannot install the game on Ubuntu/Linux.

So I want to ask is it possible to install Heroes 5 on Wine/PlayOnLinux with the same product key from Steam?

Or maybe you can recommend me a way to install it on Linux?

Ok. I am trying this with my native ubuntu 12.04 and I have ubuntu 13.04 in Virtual machine on which I am testing installation. Why Steam on Ubuntu 12.04 allows me to install Heroes 5, but it breaks when I press a keyboard key? And why Steam on ubuntu 13.04 says I cannot install it on my platform? Because it is virtual machine?

For example I see Portal/Portal2 install button on Steam/Virtual Ubuntu 13.04

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Can you play Steam games without Steam installed?

Offline Mode allows you to play games through Steam without having an active connection to the Steam Network. This feature is useful when you have limited or no internet access. Any Steam client feature that requires a connection will be unavailable while offline.

How do I install a game with a Steam key?

How to activate a Steam Game Key/Code

Launch Steam and log into your account.

Go to Games then click on Activate a Product on Steam...

Click on "Next".

Click on "I agree".

Enter the code you purchased.

Go to your Steam Game Library, highlight the game, and click install.

Can you use a Steam key from a game you already own?

No, you can not. It will say, "product already owned" and prompt you to install it or play it. Activating keys never gave users inventory games.

Can you buy a Steam game without downloading it?

You do not need the Steam client installed to purchase a game but you do need a Steam account, then you can either purchase the game via the Steam website or download the client. You will need the Steam client to install and play the game, though.

How to add a game to steam that was downloaded elsewhere | Add any game to steam library

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