Not sure about that. According to the EULA, it appears that you can only downgrade to Windows 7 if you purchased the professional edition:
Instead of using the Windows 8 Pro software, you may use one of the following earlier versions: Windows 7 Professional or Windows Vista Business.
This agreement applies to your use of the earlier versions. If the earlier version includes different components, any terms for those components in the agreement that come with the earlier version apply to your use of such components. Neither the manufacturer or installer, nor Microsoft, is obligated to supply earlier versions to you. You must obtain the earlier version separately. At any time, you may replace an earlier version with Windows 8 Pro.
Comments
Not sure about that. According to the EULA, it appears that you can only downgrade to Windows 7 if you purchased the professional edition:
Instead of using the Windows 8 Pro software, you may use one of the following earlier versions: Windows 7 Professional or Windows Vista Business.
This agreement applies to your use of the earlier versions. If the earlier version includes different components, any terms for those components in the agreement that come with the earlier version apply to your use of such components. Neither the manufacturer or installer, nor Microsoft, is obligated to supply earlier versions to you. You must obtain the earlier version separately. At any time, you may replace an earlier version with Windows 8 Pro.