(7)-7 & 1 (8)-8.7z.002 | 1

Before you try to open anything, ensure that of the archive are in the same folder.

The filename indicates that you are dealing with the second part of a split compressed archive created with 7-Zip . 1 (7)-7 & 1 (8)-8.7z.002

You must have 1 (7)-7 & 1 (8)-8.7z.001 in the same directory as your .002 file. Before you try to open anything, ensure that

This usually means you are missing one of the parts (like the .001 file) or the download was interrupted and the file is corrupted. Before you try to open anything

How to Extract Split Archives: Handling .7z.001 and .7z.002 Files