若当前DirectMesh版本已是最新，则本命令不再更多行动。
If the current version of DirestMesh is the latest one, no more action will be performed.

若存在更新版本，如下图所示的信息框将弹出。点击“是”按钮下载新版本，点击“否”取消操作。
If there is a new version, then the message box shown in the following figure will pop up. Click the "Yes" button to download the new version, click the "No" button to cancel.