Anyone claiming otherwise is trying to infect your computer, steal your data, or waste your time. No amount of compression magic—7-Zip Ultra, WinRAR, or custom repacking—can reduce an operating system to 1/30th of its original size and still have it function.
Now that you know the 100MB version does not exist, here are the methods to obtain or install Windows 8 Pro without downloading a massive file.
Understanding the intent behind this search helps provide better solutions: