VirtualBox 5.1.22-115126 x86-amd64 Multilingual

Cross-platform virtualization without installation.

Download Portable VirtualBox Online (0.5 MB) 09/03/17

Thanks to Dirk Gently for fixs

In first screen enter (twice if Extension Pack needed): 5.1.22-115126

Extract and run VirtualBoxPortable.

Don't use if you have VirtualBox installed.

Online installer is also setup extractor if you download
VirtualBox-5.1.22-115126-Win.exe (117 MB)
and Oracle_VM_VirtualBox_Extension_Pack-5.1.22-115126.vbox-extpack (18.6 MB)
in its folder.