: Ensure you have downloaded all split files ( .001 , .002 , etc.). Guide to Extracting Split .7z Files
Open only the file ending in .7z.001 using 7-Zip. CompilationOfManyBreaches_kypnothic.7z.001
Alternatively, you can right-click the .001 file and choose > Extract Here . : Ensure you have downloaded all split files (