Win7-ult-sp1-x64-u-24535-esd.iso Link -

Stands for Electronic Software Download . Unlike a standard .iso which usually contains a WIM (Windows Imaging Format) file that is uncompressed or loosely compressed, an ESD file uses a high-compression algorithm (LZMS).

This is a cumulative update containing previous security patches and performance improvements, though it adds no major new features to the base OS. Ultimate Edition: win7-ult-sp1-x64-u-24535-esd.iso

If you need help with a specific part of the installation, let me know: Stands for Electronic Software Download