For security and to ensure you are getting the "full version" without bundled malware, you should always use the official repository.
While version 18.06 is an older release of 7-Zip from 2018, it remains a stable, open-source file archiver known for its high compression ratio and support for numerous formats. Overview of 7-Zip v18.06 7zip-v18-06-full-version-download
: Run the .exe or .msi file. The installation is lightweight and typically takes less than a minute. For security and to ensure you are getting