Ss-tas-015_s.7z.001 -

7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn

Do you have the (like .002) saved in the same folder? SS-Tas-015_s.7z.001

: If prompted for a password, you will need the specific key provided by the original uploader. 7zip file with numbers on it like 001