It sounds like you're looking for a Windows 8.1 pre-activated ISO (64-bit) from a source like Kickass (KAT), but focusing on a "better install" experience.
The idea that a custom ISO provides a "better install" usually refers to the removal of bloatware. However, modern users can achieve a clean, optimized system safely using official methods: windows+81+pre+activated+iso+64+bit+kickass+better+install
Elias felt a twinge of regret, but the "Better Install" promised a snappier experience. He pushed the thought away. The "Better" Experience It sounds like you're looking for a Windows 8
He clicked through the murky depths of a mirrored torrent site, his cursor hovering over a file name that promised salvation in a string of desperate keywords: Use O&O ShutUp10++ (works for 8
If you want Windows 8.1 64-bit, there is a better install method. It requires 10 minutes of setup and a $10-$20 investment.
Option B (The actual best): Buy a legitimate Windows 8.1 Pro key from a discount market (e.g., StackSocial, G2A, or eBay for $12-$20). These are usually OEM keys pulled from dead laptops. This is infinitely safer than a torrent.