官方解释：
If you're looking for the latest VirtualBox 6.0 packages, see VirtualBox 6.0 builds. Please also use version 6.0 if you need to run VMs with software virtualization, as this has been discontinued in 6.1. Version 6.0 will remain supported until July 2020.
If you're looking for the latest VirtualBox 5.2 packages, see VirtualBox 5.2 builds. Please also use version 5.2 if you still need support for 32-bit hosts, as this has been discontinued in 6.0. Version 5.2 will remain supported until July 2020.
机器翻译：
如果您正在寻找最新的VirtualBox 6.0软件包，请参见VirtualBox 6.0版本。 如果您需要通过软件虚拟化运行虚拟机，也请使用6.0版，因为该版本已在6.1中终止。 6.0版将继续受支持，直到2020年7月。