Thank you. That's what I thought but it won't work.
The "Start" sign here is a little blue square with a square cross on it.
A left click on it does show Alibre and others, but they can't be drag-copied anywhere.
Right click does not open the Applications list directly, but a long "Settings" menu containing "Installed Apps". This is a more analytical tool, showing programme sizes and a degree of user's control over what is installed or not. Again, although Alibre is right at the top by starting with "Al", it can't be dragged onto the desktop.
Aaaargh! Problem solved! Only just spotted it!
The up-date has put a new Desktop symbol up, helpfully labelled "Alibre Atom 3D 27…". (So those first two digits are the version.). It was right up at the top corner, hiding among a lot of other things I'd not normally look at – the original symbol was a lot more noticeable!
Right, I have now deleted the V26 symbol and moved the V27 one into its place on my normal sight-line!
Oh silly-billy me. The digital equivalent of me putting a big spanner down on the bench then failing to find it five minutes later.
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One problem cleared. Now, what has IMSI done to my TurboCAD to make its easy bits harder?