Ran into a couple of problems here:
Default Debian behaviour is to mount cd’s with noexec option. Thus you get permission denied even as root when you try to run the install script. Solution; remount cd:
sudo mount -o remount,exec,ro /media/cdrom0
or whatever path the cd is mounted at. You need the ro otherwise it complains.
Other more general problem: sudo ./install just results in Installing... Finished and a silent fail. In the old days using gksudo fixed this but apparently it’s deprecated now. It does work when running as normal user, so tried:
sudo -E ./install
this worked correctly.
