Thank you Colin.
I remember seeing that edition of the course mentioned, yes.
Not only a readable size as-is, but can also be enlarged a bit further by the normal screen controls (as I have often done with pdf documents.)
I doubt I still have the link as I no longer have the original trial version, but although the Alibre short-cut's there on the screen, trying to open it fails immediately with a Licence Expired message.
I re-loaded it yesterday to avoid operating-system problems SillyOldDuffer warned me may occur by my having merely deleted the programme, rather than removing it properly. (I'd forgotten where to find the control.)
'
BTW I had an amusing moment when I followed that CAD/CAM link JasonB posted a few message back. I have set my PC's protection fairly high, but I'd not bargained for making a model water-pump to arouse the "BT Parental Controls" into asking if I wished to authorise my reading it!