Both utilities can be found at the download link below. It works by directly modifying the ISO's file table, so there is no need for a time-consuming extraction and rebuild (it will be done in less than a second), and the process is completely reversible. Update: There is now a second, alternate utility available that 'deletes' ei.cfg from the ISO image, thus converting any Windows 7 disc into a 'universal' disc. It's just something to prevent unnecessary downloads and let you back up these ISO images with far less duplication of data. And obviously, you will need to already have one of the official disc images in order to use this. The converted ISO will be exactly the same as what you download from MSDN/TechNet, and the SHA-1 hashes should match those officially posted by Microsoft. This is a set of binary patches (and a tool to apply these patches) that does this conversion between RTM disc images. You can either sit through another download from MSDN (takes time and wastes bandwidth), or you could make a copy of your Ultimate ISO and convert that into a Professional ISO, because, except for a handful of bytes, the two are virtually identical.
For some reason, you also want the 32-bit Professional ISO. Let's say that you've downloaded the 32-bit Ultimate ISO from MSDN. Extended Security Updates (ESU) are available through specific volume licensing programs for Windows 7 Professional, Enterprise, and Professional for Embedded Systems editions of this product, for up to an additional three years past the end of support. This is a little thing for people who download images from MSDN or TechNet. Windows 7 follows the Fixed Lifecycle Policy.
