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Download the NeverWare's ChromeOS build from http://www.neverware.com/freedownload
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Extract the *.bin.zip
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Convert it to VDI.
vboxmanage convertdd chromiumos_image.bin chromiumos_image.vdi
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mv chromiumis_image.vdi C:\t\v\chromeos\
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Create a VM with settings:
- Guest OS type: Linux/Other Linux
- 2048 RAM
- Use existing chromiumos_image.vdi as hard disk
- Enable EFI (special OSes)
- Enable PAE/NX
- change pointing device to PS/2 Mouse
- Start the VM
The ChromiumOS distribution CloudReady was discontinued some time after Google acquired the company that offered it. As mentioned above the successor is ChromeOS Flex but there don't seem to be any official virtual machine images available.
Downloading the virtual machine image
The CloudReady OVA file mentioned in the knowledge base article is available on the Wayback Machine (direct download).
The download from the Google Drive link above is unsurprisingly much faster.
The version of the CloudReady OVA is actually fairly dated. The virtual machine image was created using CloudReady 83.4.4 and the last released version seems to be CloudReady 96.4.6, which is available on the Internet Archive.
Running ChromiumOS in a virtual machine
https://web.archive.org/web/20190130020129/https://neverware.zendesk.com/hc/en-us/articles/360001615368
CloudReady in VirtualBox
CloudReady 83.4.4 ChromiumOS in VirtualBox 6.1.40 on macOS 10.15.7 (hangs on boot screen, see above)
CloudReady in VMware Fusion
CloudReady 83.4.4 in VMware Fusion Player 12.1.2 on macOS 10.15.7 (seems to work fine)