Even Chrome has to connect to a server and download the extension for installing it into your Chrome Browser.
The URL for getting the extension directly is the following:
You have to replace the 4 tildes (~~~~) with the ID of the extension you want to download.
For example if you want to download Google Maps you can find the extension on
The extracted ID of Google Maps is
The direct download URL for Google Maps will be
The downloaded file will always be named as
In our example with Google Maps it is
extension_5_2_7.crx, because the current version of Google Maps is 5.2.7.