If you're interested in this icon pack or similar customization tools, here are some great places to look:
In 2013, modifying system files on Windows 8.1 was notoriously risky. Microsoft had introduced stricter digital signature verification and system file protection mechanisms. Standard desktop customization methods frequently resulted in the infamous "Black Screen of Death" or boot loops. windows 7 icon pack by 2013 windows 81 portable
Users could run the tool directly from a USB flash drive or a temporary folder. If you're interested in this icon pack or
(also known as "imswordking" or "imswordqueen") began creating automated tools to revert the visual changes of Windows 8 and 8.1. The Evolution Users could run the tool directly from a
Small executables that swap system icons without modifying core Windows files permanently.
Disclaimer: Modifying system files can be risky. Ensure you have backed up your system, and understand that these tools were popular in 2013-2015, so ensure you are using the most up-to-date versions compatible with Windows 8.1.
Transform Your System: The Ultimate Windows 7 Icon Pack for Windows 8.1 Portable