I had installed The GIMP on my wife's machine way back when. Version 2.2 on Windows. She wanted to scan and crop photos, and it seemed a good way to introduce the idea of free software to her. Free, as in hobbyists are writing it and giving their work away for free. The GIMP can do an awful lot, and my wife could see that we didn't have to pay a lot of money for an app that duplicates that The GIMP does. And, you can see that the world is just a little bit nicer, that people do good works and share it.
Alas, I had to work on her machine a week or two ago. While I was there, I upgraded to The GIMP 2.6.
The GIMP 2.6 does not do "Acquire from TWAIN'. Heck, that was the whole reason she used The GIMP.
Nicely enough, the downgrade was blindingly simple. But she will have to remember to never ever upgrade.