Your company has upgraded to the latest version of 3CX Phone System v15.
Updates to the 3CX client for Mac are deployed automatically via the 3CX Phone System Server. When a new update is available on the 3CX Website, the 3CX Phone System Server downloads the update for the 3CX client will notify you. If you have an out-dated 3CX client, upon starting it you will be shown a message informing you that a new version is available.
Once you accept the update, the downloader will start and download the new installation of the 3CX client for Mac. After the file has finished downloading, the new client will be installed automatically and 3CX client will restart on its own to complete.
Upon startup it will configure itself automatically based on the configurations you had previously.