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As a work-around for the time being you can download the documents from Actionstep to your local workstation and then open them in MS Office. When you have finished editing you will need to replace the version in Actionstep with your locally-modified copy.
Alternatively, reverting the update may restore the functionality for you. However, we strongly advise you to consult an IT technician before doing so, as doing this could result in potential security issues.
We apologise for any inconvenience this may cause you and we are working diligently to resolve the issue. Thank you for your patience.