Downloading individual DLL files from "DLL aggregator" websites is generally discouraged by security experts for several reasons:

The file is a critical component of the OpenSSL toolkit, specifically the version 1.1 branch designed for 64-bit Windows systems. While often sought as a quick fix for application errors, "downloading" this file from third-party sites carries significant technical and security implications. The Role of libssl-1_1-x64.dll

OpenSSL 1.1.1 reached its "End of Life" in September 2023, meaning it no longer receives official security updates from the OpenSSL Project. The Risks of Manual Downloads

Insecure libssl-1_1-x64.dll installed with Power BI Desktop July 2025