Unable to run pscanloader file on Linux

Not sure if I have misread something on this page: https://pscan.uk/install/linux.html

I have the pscanloader file in a folder. But when I double click the icon, I get a message saying 'There is no application for executable...'

I don't know what this means.

This is a fresh install of Ubuntu, I've done nothing but run the Ubuntu installation and then download the pscanloader file.

Thanks.

Have you done what is said in Step 3. at https://pscan.uk/install/linux.html "Set file permissions" and set file as "executable"?

Until I figure that out, please open a terminal window and type the following commands:-

cd pscan.uk
./pscanloader