How to install an already downloaded .crx file extension in chrome?
This is a known issue.
Download the .crx file. Drag and drop the downloaded novell-moonlight-3.99.0.3-i586.crx
file into Google chrome browser.
If you get any error mentioning "Apps extensions and user scripts cannot be added from this website", open chrome://chrome/extensions/
in a new tab and now repeat the step 1