Microsoft is distributing Windows 10 via its Windows Update service as downloadable ESD files. Here is how you convert those ESD files into ISO format which serve to install Windows 10 from DVD or USB-Drives.
Microsoft is offering Windows 10 as a free upgrade for users of Windows 7, Windows 8, RT or 8.1 and has pushed out the final Windows 10 RTM build already to preview testers. But you can download the Windows 10 update directly as an ESD file and convert it to ISO format. Here is our simple five step tutorial.
Alternatively you can get your hands on ISO images created by other users. Be aware however, that those ISO images might be corrupt or infected with malware. It is very recommended to create the Windows 10 RTM ISO from the official Windows Update ESD files.
1. Download the official Windows 10 RTM ESD files from Windows Update
2. Download and decompress ESD Decryptor 6
ESD Decryptor 6 is a free tool to decrypt and convert ESD files to ISO format. You can download it from different sources on the internet. Usually it is located on filehosters like here. To be secure that it is not infected by any virus, you can upload the small file to Virus Total for free to get a complete report. Be sure to use at least version 6. Previous versions are not capable to decrypt the Windows 10 Build 10240 RTM version.
To decompress the 7z file format you need to use the popular 7-Zip tool. When you decompress the ESD Decryptor 6 package, it will create a directory with all the needed files. No installation is required.
3. Place Windows 10 ESD file in the ESD Decryptor 6 directory
4. Run ESD Decryptor 6 with admin rights
Right click on decrypt.cmd and choose Run as administrator. This will open ESD Decryptor 6 in a command line window.
5. Create Windows 10 ISO file
ESD Decryptor 6 offers five different options to convert Windows 10 ESD files into ISO format. The first one Create ISO with Standard install.wim is the most secure way to get a functioning Windows 10 ISO file.
If you plan to install Windows 10 from a smaller USB stick, you can also try Option 2 – Create ISO with Compressed install.esd.