Rebuild source image using Apply -> Rebuild Source Images menu.

Apply & save changes to source image using Apply -> Apply & Save Changes to Source Images menu.

Remove all required Windows components using Remove -> Remove Windows Components menu (This could take hours depends on how many components you want to remove).

Cleanup the source image using Apply -> Cleanup Source Images menu.

Select the source image using Source -> Select Source from Folder menu.

Extract the source image using Source -> Extract Source from DVD ISO Image menu.

Agree to ToolKit’s EULA by pressing A key.

Copy your new Windows ISO image to ToolKit’s ISO folder.

Extract downloaded ToolKit archive file.

Next, we need to remove the extra Windows components to further reduce the storage after the operating system is installed. The new image (the first) is a few hundred megabytes smaller than the original image.

Save the Windows image using File -> Save.Replace the original install.win with the new extracted small installation image in UltraISO using Actions -> Add Files.Open install.win from Dism++ using File -> Open Image FileĮxtract the smallest image using Export image (Choose Max in Save as type).Open the Windows ISO image from UltraISO using File -> Open.Įxtract install.win from sources folder using Extract To.If the Windows image contains multiple versions, we can reduce the size of the image by removing the extra versions. We need an official Windows 10 image (you can find the official download URL from TechBench by WZT) and several other tools to rebuild that image.įind a Windows PC to complete the following steps. My solution is to use a Windows virtual machine, but the image is one of the most simplified version. Since I usually use macOS, in some specific situations, such as using the full version of the Office, I need to temporarily use the Windows.

Build custom windows 10 image vmware