Before running any demos please make sure you have the latest version of PsychBench since they may use features only available in recent versions. You can type pb_update at the MATLAB command line to check.
Below are links to demo experiment scripts in the coding method (MATLAB m files). These are also available locally in <><PsychBench folder><>/demos, so if you want to run one you can just do it from there.
Below are links to demo experiment spreadsheet files in the visual method (Google Sheets files). You can make copies in your own Google account if you want to modify them (Google Sheets → File → Make a copy) and download them to run them (Google Sheets → File → Download → Microsoft Excel). If there is no link then we just haven't gotten around to making the visual method version yet.