Download portable VirtualBox 4.3.16-95972 x86-amd64 Multilingual

Cross-platform virtualization without installation.
Download Portable VirtualBox MultiVersion Setup Extractor (0.5 MB)
Download VirtualBox-4.3.16-95972-Win.exe (105 MB) and _VM_VirtualBox_Extension_Pack-4.3.16-95972.vbox-extpack (15 MB) in the same loion of Setup Extractor.
In first screen enter: 4.3.16-95972
Extension Pack available
Extract and run VirtualBoxPortable.
Settings of installed VirtualBox should be preserved.