我已经打开visual studio安装程序，单击修改，并启动visual studio。这解决了问题。

我从Windows任务管理器中启动了Windows安装程序服务，然后打开了Visual Studio 2019 (这里建议的解决方案对我来说很有效)

试着重新启动你的电脑。这对我很管用。

很可能Visual Studio正在更新，就像错误消息暗示的那样，如果你等待几分钟更新完成，你应该能够再次运行Visual Studio而没有问题。

If the problem persists or if you're just curious, open up your task manager and see if there is anything related to (Microsoft) Visual Studio running but don't just kill the process. Check instead if the process is using any resources - if it has a high I/O count, then it's actually updating and you should let it do its thing. If CPU-usage and memory usage remain mostly constant and there is no disk activity for the process for several minutes, this could mean that the process is stuck. You might have to kill it, but proceed with caution. Hopefully if this is an update for Visual Studio, the process name should include a version number or some sort of indication of what kind of update is being applied that you can use to search for more information through a search engine or through Microsoft's online resources.

给点时间再试一次。 在任务管理器中结束与visual studio相关的所有任务。 如果这两个解决方案都不工作，那么重新启动机器，它肯定会工作。

对于VS2019上的相同问题，清除%temp%文件夹对我有用。