More often than not, Microsoft does not usually provide bootable ISO images for each and every build or version of Windows released. However, as ESD is encrypted and new, it’s not common in ISO, or when burned to DVD or USB flash drive. The advantage is ESD file is that it’s more secure and smaller in size comparing with WIM file, making it faster to download and install. An ESD file is essentially the encrypted or decrypted but highly solid compressed format of regular compressed WIM file format (Windows Imaging) which is normally included in a typical Windows ISO image.
The main Windows OS files are stored in a file named Install.esd inside Source folder, which is more than 2 or 3 GB in size. Windows Update normally downloads and stores the required Windows install files on C:\$Windows.~BT folder. Microsoft has switched to ESD (Electronic Software Download) file format to deliver installation files required to install and upgrade Windows operating system between major version through Windows Update, such as from Windows 8 to Windows 8.1, Windows 8.1 to Windows 10, between various builds of Windows 10 Technical Preview and Insider Preview released to Windows Insiders, and future beta builds or future versions of Windows OS.
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