The reliability calculators in the Assessment Lead Programme are, at present, macro-enabled Excel files and should open on a Windows desktop of Excel.
While some of the sheets and cells are password-protected, you should be able to input and edit data without a problem - the interpretation cells should need no further editing.
However, as they are macro-enabled files in Excel, we have encountered some difficulties with Mac compatibility, where the whole workbook shows up as password protected, or where the macros simply don't work.
We're working on a fix for this problem, but if you have access to a Windows device, do try using them on there to get around this issue; if not, contact us and we'll try our best to help!