Redownload the file entirely and update your extraction utility to the newest version.
Given the nature of the file, accessing it directly is not possible without authorized credentials. Here is a practical guide for legitimate access: www.topscloud.net doc-eng.rar
You may find the doc-eng.rar file directly, or you may find the manual in a different format, such as a .pdf file. Redownload the file entirely and update your extraction
Re-verify the download URL and ensure the suffix explicitly reads doc-eng.rar . www.topscloud.net doc-eng.rar