Archive:  installer.zip
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.
unzip:  cannot find zipfile directory in one of installer.zip or
installer.zip.zip, and cannot find installer.zip.ZIP, period.

Since I suspected it might be an access issue, I have used chmod -R 777 on my FreeSurfer installation category. Also, using "sudo" before "fs_install_mcr" causes the bash not to recognise fs_install_mcr command. Any suggestions?

Bests,

Amir