Added APK files taken from ApkCombo site here.
- VirtualBox Manager v6.0.5 (6000500)
- VirtualBox Manager Premium Key v3.1.7 (317)
- VirtualBox Manager Premium Key Mod v3.1.7 (318)
(EDIT: Added modded Premium Key apk. The mod was editing Target SDK Version to 35 and changing build number to 318. I have included manifest.xml for each.)