Soooo, yeah. As a long time 40k player, Chaos Gate has sort of been a holy grail for me. The problem is the installing.

I apologise for this, since i'm only doing this because i'm an absolute fool when it comes to installing things.
If anyone would be so kind as to:

1: Make a step by step guide installation for a Windows 8 user (Oh, and because there's so many people doing different things all at once that i'm just plain confused)
2: Answer the question of DirectX 9.0c for windows 8 as the one on Microsofts website refuses to work with said OS.
3: Wether to use GOG Galaxy to use for said OS. Primarily asked out of concern that it might mess Chaos Gate up.

Don't use Galaxy.
Manual DL and manually install from library.

Again, my lack of experience is showing. By manual DL i'm assuming you mean download it straight from the site, correct? I'm so, so sorry btw.

Yes,go to library,click game and then (more)and then DL files via browser or
Gogdowner.
Once all files are DL,to install just double click (setup) file.

Nice to see I am not the last person here following the old ways (browser download) :o)

Yeah,I've always used the browser to DL from here.Just don't want crap on my PC.:-)

I always use it for smaller downloads (less than 1 GB), because it's the most direct method.

Rather confused about the library thing since i don't see it anywhere.

Account (upper right corner of this site) --> library --> now click on the game you want to download. A pop-up opens. Download the files under Game Downloads (left side) by clicking on them (some games are splitted in more files).

exactly :)
if that somehow should cause problems (wouldn't know how) here's the link to download the windows installer of chaos gate:

https://www.gog.com/downlink/warhammer_40000_chaos_gate/en1installer3

can't help with win8 though if there should be any problems, since I'm a linux person myself.

You guys are great, y'know that? You're not like the typical person who uses vague suggestions or outright insults you.

On the game card it says that the game works with windows 8. So there shouldn`t be a problem.

Unfortunately, read the reviews.

But then there are other Windows 8 users who say they can run it? Can anyone confirm?

Just keep in mind that there is a 30 Day Money Back Guarantee. If you meet the mimimum requirement of the game and the support can`t help you to play the game you can get your money back.

Minimum system requirements - Windows:
Windows XP/Vista/7/ 8
Processor: 1.8 GHz Processor
Memory: 512MB RAM (1 GB recommended)
Graphics: 3D graphics card compatible with DirectX 7 (compatible with DirectX 9 recommended)
Hard Drive: 2GB HDD
Mouse, Keyboard.

Full information about it can be found here:
http://www.gog.com/support/website_help/money_back_guarantee

Important parts for you:

What is the Money Back Guarantee?
At GOG.com, we're confident in the quality of the games we sell and the work that we put into getting them ready for you to play them. If a game that you've bought on GOG.com doesn't work and our team of expert Support staff can't solve the problem for you, we will give you back your money.

How does it work?
If, within 30 days after the purchase of your game, you experience technical problems or game-breaking bugs that prevent you from finishing your game, contact our customer support. They will do their best to help you fix the problem and if, at the end of their attempts to solve the problem your game is still not working, we'll give you back your money.