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Step 1 (Creating a bootable macOS Sierra ISO for VirtualBox):

1. hdiutil attach /Applications/Install macOS Sierra Public Beta.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
2. hdiutil create -o /tmp/Sierra.cdr -size 7316m -layout SPUD -fs HFS+J
3. hdiutil attach /tmp/Sierra.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/install_build
4. asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase
5. rm /Volumes/OS X Base System/System/Installation/Packages
6. cp -rp /Volumes/install_app/Packages /Volumes/OS X Base System/System/Installation/
7. cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS X Base System/BaseSystem.chunklist
8. cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS X Base System/BaseSystem.dmg
9. hdiutil detach /Volumes/install_app
10. hdiutil detach /Volumes/OS X Base System/
11. hdiutil convert /tmp/Sierra.cdr.dmg -format UDTO -o /tmp/Sierra.iso
12. mv /tmp/Sierra.iso.cdr ~/Desktop/Sierra.iso

Download macOS High Sierra 10.13.1 ISO Installer for Mac, VMware and VirtualBox macOS High Sierra 10.13.1 MacOS HighSierra has been released officially. The MacOS High Siera 10.13.1 update includes bug fixes.

Step 2 (Installing in VirtualBox)

This is pretty straightforward.

Mac Os Sierra Iso Download For Virtualbox Code Pc

1. Create a new El Capitan (there is no option for Sierra at the moment) machine. Leave everything at default
2. Boot the virtual machine from the Sierra.iso you created, which you'll find on your desktop. I had to mash F12 while the machine was starting up and then choose 'EFI CD/DVD' in the boot manager. YMMV.
3. The install process should be familiar to you. If not, you probably shouldn't be playing with a beta OS ;)
4. Grab a coffee, the 15 minute estimation the installer gives you is a complete work of fiction. My install took over an hour.
5. Once installed, reboot and complete the new user process. Skip the AppleID login bit, it'll fail on a VirtualBox.
6. Shut down the virtual machine and quit VirtualBox.