Where to find the Windows 8 ISO? [closed]
That depends where you bought it from and which version...
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There is the upgrade version (39.99 for a limited time) that require a previous install and are download only before you can create the restore disc.
In this case: You would have to install a different version of windows (XP SP3 or newer, activated with a Valid license) in VBox first, then inside that, download the upgrade pack from the MS Store (Again, assuming you bought it there).
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The other notable version is 69.99 and is physical (meaning you wait to get the disc).
In this case, you could rip an ISO or install it from physical - if you would like that info, let me know.
Here is MS's site for it with that info: Microsoft Store Online
If you bought it elsewhere, please provide us a link and I will take a look and update my answer for you.