Yes in unix server do the following. This is needed to delete the setup folder (after installation or upgrade or replace old osticket)
# Change directory permissions (0555 -> 0755)
find /path/to/your/directory/support/setup -type d -perm 0555 -exec chmod 0755 {} +
# Change file permissions (0666 -> 0644)
find /path/to/your/directory/support/setup -type f -perm 0666 -exec chmod 0644 {} +