Also, what do you mean by "all-in-one"? You want to put both Windows 7 and 10 on the same usb stick? Or it's some kind of image from getintopc.com? If so, I doubt about the quality of it. AFAIK an all-in-one image of Windows 7 was never distributed, so it's likely they modified the original images of different edition and bundled them together.
The version of Windows is mostly set by the activation code you use. Those hacked setup disks are not really legal, since, well, they are hacked setup disks. That is why 90% of the people with $100 computers are running $300 versions of Win 7 Ultimate.
Now i've successfully downloaded genuine Windows 7 Home Premium x64 (August 2018 update) using Windows ISO Downloader and it's taking up 5.68 GB of disk space, while the Windows 7 All-in-one 32 + 64 bit that i got from Softlay only takes 3.81 GB.
According to microsoft, Windows 7 requires at least 4 GB and Windows 10, 8 GB.
I didn't want any trouble so i downloaded the genuine windows.
It's a shame Microsoft doesn't let people download the Windows 7 disc image without key (or with oem key).