unzip: cannot find zipfile directory in one of gaster-Linux-x86_64.zip or gaster-Linux-x86_64.zip.zip, and cannot find gaster-Linux-x86_64.zip.ZIP, period.

[A11pwnX]

******@Latitude-E5440:/T1XLNB/SSHRD_Script$ sudo ./sshrd.sh 15.5
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
Archive: gaster-Linux-x86_64.zip
unzip: cannot find zipfile directory in one of gaster-Linux-x86_64.zip or
gaster-Linux-x86_64.zip.zip, and cannot find gaster-Linux-x86_64.zip.ZIP, period.
[-] An error occurred
******@Latitude-E5440:/T1XLNB/SSHRD_Script$ uname -a
Linux Latitude-E5440 6.14.0-29-generic #2924.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Aug 14 16:52:50 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
*******@Latitude-E5440:/T1XLNB/SSHRD_Script$