Friends who are new to Mac computers，Do you know how to check the system version of Mac and how to upgrade the system version? Here the editor brings you a detailed tutorial。This common sense is very practical for Mac newbies，赶紧收藏起来吧！ 如何查看当前Mac电脑的系统版本 1.点击左上角的苹果标志。 2.Select "About This Mac"。 This will display the system version number of your Mac computer。 macOS操作系统升级教程 macOS 10.15 The official version will be launched on September 25, 2019。If you purchased a Mac computer after October 2019，This new Apple desktop operating system should come pre-installed。Apple's operating system and Wi....