Extensions are released as ZIP files, so there is no installer to run, all you need to do is unpack the file.
After you've download the file, right-click on it in Explorer and choose "Extract all".
Then choose where you want to unpack the files.
Each extension should be unpacked into its own separated folder.
The recommended location is in a sub-folder under the ChannelPlugins or ChannelHooks folder in the Awasu installation folder e.g. C:\Program Files\Awasu\ChannelPlugins\.