Problem opening last year's Xway file


I created a website about 18 months ago using the first beta of Xway, on the Mojave OS platform. Now I find I cannot open it at all on Catalina with the new beta Xway. I am given the message ‘Xway cannot open files in the “Xway document” format’. This seems rather peculiar and is very frustrating. Can you help me please?

Join to automatically receive all group messages.