You must have 1 (7)-7 & 1 (8)-8.7z.001 in the same directory as your .002 file.
You cannot open the .002 file by itself. It contains only a portion of the data and requires the other parts to function. 2. The Golden Rule: Keep Them Together 1 (7)-7 & 1 (8)-8.7z.002
How to Extract Split Archives: Handling .7z.001 and .7z.002 Files You must have 1 (7)-7 & 1 (8)-8
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
The filenames must be identical except for the numbers at the very end. 3. How to Extract the Data
Before you try to open anything, ensure that of the archive are in the same folder.