仅当范围设置为 All packages 时,才能从注册表安装包:
1.打开 Package Manager 窗口,然后从包范围下拉菜单中选择 All packages。

2.从包列表中选择要安装的包。包信息将显示在详细信息视图中。
**注意:**默认情况下,Package Manager 不显示预览包。如果您在包列表中没有看到某个包,则这个包可能是预览包。确保在 Package Manager 窗口的 __Advanced__ 下拉菜单下启用了 __Show preview packages__。有关更多信息,请参阅[包含预览包](upm-ui-list.html#ShowPreview)。
3.选择要安装的版本。有关可用版本的更多信息,请参阅查找特定版本。
4.单击 Install 按钮。
进度条结束后,即可使用新的包。
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