Hey, you would need to include a space between ‘sudo’ and the file, as well as removing the ‘script’ at the end.
You should also make sure you are inside the same directory that the file ‘install-printer.sh’ is in. Do this by navigating to said folder, right clicking inside the window and selecting ‘open in terminal’, or alternatively opening a terminal and typing cd /path/to/directory/with/install-printer.sh/inside/it
When you are in the correct directory, type into the terminal: sudo ./install-printer.sh