If you only have Alissa.7z.001 and no other parts, the download is likely incomplete, and the file cannot be opened. To help you further, could you tell me:
This article explains what these files are and how to properly extract them. What is a .7z.001 File? Alissa.7z.001
Ensure Alissa.7z.001 , Alissa.7z.002 , Alissa.7z.003 , etc., are in the same folder. If you only have Alissa
A .7z.001 file indicates that a larger archive (likely a folder, game, or software named "Alissa") has been broken into smaller pieces—starting with .001 , .002 , and so on—to make downloading or storing it easier. Ensure Alissa
(e.g., .002, .003) in the same folder?
Ensure all parts are in the exact same folder and have the correct names before the .7z.001 extension.
This happens if you are missing subsequent parts (002, 003, etc.) or if one of the parts is corrupted.