Always telling plugin required but it's already installed (Chrome, Windows 7 64bit)

I managed to install developer plugin in Firefox and IE and it's working. Not so in Chrome. I'm using Windows 7 (64Bit) and my Chrome version is 31.0.1650.63.

When I navigate from "Plugin required" page to Webstore, it tells me that it is installed (green button top right). In fact I've done that many times.

I cannot find anything in console.

Found some posts where they recommend installing plain .crx file but haven't found a way to download it.

I hope somebody can help me since Chrome is my favorite browser.

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