This usually happens if you try to open the .002 file directly instead of the .001 file.
If you don't have an extraction tool, the official 7-Zip website is the standard, though others like WinZip or Unzip One also work. llP1LC.7z.002
Right-click llP1LC.7z.001 , hover over 7-Zip , and select "Extract Here" or "Extract to..." . This usually happens if you try to open the