By transforming 8.1, you get:
If you are stuck on a Windows 8.1 machine—perhaps due to work requirements or older hardware—but you miss the Aero Glass transparency and the classic Start Menu of Windows 7, you don’t have to downgrade your OS. You can simply give it a makeover. windows 81 to 7 transformation pack
You have a specific piece of industrial software or a low-end laptop that runs 8.1 perfectly but where Windows 7 drivers don't exist. It modernizes the look without a performance hit. By transforming 8
If you only install one thing, make it this. Microsoft removed the Start Button in Windows 8, then gave us a weird hybrid in 8.1. (formerly Classic Shell) fixes everything. By transforming 8.1