Thank you - I am most grateful for your replies.
It is reassuring to hear about Armory continuing. The machine I used in fact has not been run since I used Armory, for a long time now. I took a 'paper backup' at the time. I do not think I created a special offline wallet - is that what a watch-only-wallet is? My wallet is a normal wallet which ran online. I simply stopped using that machine. I trust the machine itself will still work anyway if I now run it as a computer. I guess that the Armory outdated software and the outdated bitcoin software will not operate successfully in today's environment?