Intel has moved many older drivers to "End of Life" status, meaning they no longer receive security updates. You can find the relevant downloads at the following official locations:
The "15.4251" refers to the last four digits of the build version. Intel groups these under broad family versions. Use the following links based on your processor generation: For 6th Gen to 10th Gen Processors : Download the latest compatible package from the Intel Download Center For 4th and 5th Gen Processors
Verify your CPU generation via Windows Task Manager (Performance tab) and download the appropriate driver generation family. Screen Flickering During Installation
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