Aus Cryptshare Documentation
In order to deploy an update of Cryptshare for OWA go to the Cryptshare Administration Interface → Add-On Products → Cryptshare for OWA. Under the tab General you can upload the new version of the add in. You can get the latest version at www.cryptshare.com.
Further steps in Exchange
After the add in resources have been uploaded to the server they are available for Exchange. It may be necessary to execute additional steps in your Exchange environment in order to deploy the new add in version to the users.