How to update the extension?
Open the AtomX Manager program you installed earlier.
If you haven’t installed the manager yet, or want to update the extension manually, follow the instructions in the How to install the AtomX extension.
If a new version of the extension is available, you will see the following:

Simply click the update button and you will have the latest version of the AtomX extension installed.

Roll-back / or change the version
If the actual version has errors for some reason, or you want to test the beta version, you can install it by selecting it from the list of versions.

Manual Update
Simply download the AtomX version from the website and follow the manual installation instructions. The extension will be installed over (replace) the old one.
See the manual - How to install the AtomX extension section in the Manual Installation tab.