ContactAtOnce! Agent Client Upgrade

Anyone wishing to upgrade the ContactAtOnce! client to the newest version should follow the instructions on this page. If you can see the CAO boomerang in your system tray, please stop the application by right clicking on the boomerang and choosing Quit.
Then, download the upgrade program and follow the upgrade instructions below.

Download Options


Download MSI as a compressed(.zip) file
Note: Use this if you cannot download a .msi file due to firewall restrictions but you can execute a .msi.

Download Application (Not as an MSI) as a compressed(.zip) file
Note: Use this if you cannot execute a .msi file.

Download Application without Launcher as a compressed(.zip) file
Note: Use this if you cannot execute a .msi file.

Thin Client/Terminal Services configuration

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Upgrade Instructions

    • When prompted to Save or Cancel, choose Save. The file will be saved to the default location on your computer for downloads.
    • Depending on your browser, the download confirmation box may appear differently. The example above is from Firefox and the example below is from Internet Explorer. Regardless, you should still choose Save.CAO44-2
    • Once the download has completed, you must execute the upgrade. If you downloaded the .msi file, you will be presented with the following option. Press “Run” to continue. If you downloaded the .zip file, you can open the zip and double click the .msi file to start the upgrade.
    • The next screen you see confirms that you are starting the upgrade process. Click “Next” to continue.
    • The upgrade will install over the previous version in the same file location. Choose if you want the program to be available for anyone logged into your computer or just yourself and click “Next” to continue
    • Click “Next” to continue giving your final confirmation to install the upgrade.
    • When the upgrade completes, you will see the following screen. Click “close” to finish the upgrade process.
    • Your Profile will be upgraded. Click OK to continue.
    • If the Profile upgrade is successful, you will see the following message.
    • The 5.XX Client will automatically launch itself and set your status to “online”. You will see the new orange boomerang in your system tray as shown blow. Double click the boomerang to bring up the chat roster.

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Upgrade Failure

If for some reason the upgrade does not work, click on the Upgrade Did Not Work button below and follow the instructions for a manual upgrade.


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If you require assistance, at any point in this process, click on the “Chat Live” button at the top left or call 1 (678) 648-6961 (US) or +44-(0)-330-808-0201 (UK).