[SOLVED]Install Google Chrome Extension?

Hi guys, I recently installed Chrome on my dads computer, and now am trying to install an adblocker.
I want this one:
https://chrome.google.com/extensions/detail/gighmmpiobklfepjocnamgkkbiglidom
But I get a message ‘ Google Chrome Extensions are not supported on your browser. Please download the Beta Channel of Google Chrome to install extensions. ‘ which points to a dead link (beta ended last year)
So, what do I do now?
Don’t mention Firefox please, this is about Chrome.
Answer #1
The beta does now exist btw. Click the link given to download it. I use it.
Answer #2
You need to install the developer version of google chrome. This lets you use all the extensions.
http://www.google.com/chrome/eula.html?extra=devchannel