VirtualBox 5.1 also includes several other enhancements and bug fixes. Some of the notable enhancements include:

Nah the file size is crazy [PES 2021 with VirtuaRED v5.1+stadiums]

Source: Al-Qudah, M. A., et al. "Virtualization-based security: A survey of virtual machine monitor (VMM) security." Journal of Network and Computer Applications 121 (2018): 102-115.