Are you seeing this error with a like ChemDraw, or with a general file you downloaded?
: This clears any temporary processes that might still be trying to access the old installer files. Non.7z
: Temporarily remove the 7-Zip application from your computer to prevent software conflicts during the installation. Are you seeing this error with a like
: Delete the installer file you previously downloaded to ensure no corrupted data remains. : Delete the installer file you previously downloaded
: Download a fresh copy of the installer and run it again. Alternative Causes
: If you encounter a similar error message like "Can not open file as archive" while manually using 7-Zip, it often means the file's start or end headers are damaged. Expert users sometimes use hex editors to repair these headers .
: Some technical sites like Yodot suggest using specific repair utilities to scan and fix the internal structure of the .7z file if redownloading doesn't work.