Mac OS.
In my downloads folder I have:
starforc_nex.zip
starforc.zip
I enter this into terminal:
cd ~/Downloads unzip starforc_nex.zip
Which creates two folders in my downloads:
_MACOSX (empty)
starforc_nex (contains unzipped files)
Then I enter:
xattr -d com.apple.quarantine nexprep.sh
Resulting in this message
xattr: No such file: nexprep.sh
Leaving this still to be entered.
./nexprep.sh starforc