so tool options should be under Users? I don’t see it…there’s tool presets in gimp 2\lib\gimp\2.0\tool-presets
Is the folder hidden? You might have to change your folder options to reveal hidden files and folders.
no, it’s under my name (under gimp, of course)…and is not a hidden file
aha…found it!! …sorry, was in an old file 
…so is it best to open in windows or use gimp
I’m not sure what you are asking. You have found the file “gimp-curves-tool.settings” that Gimp uses to store curves, yes? And that file doesn’t have any curves because of the upgrade? And you have a backup of that file?
Then rename the file to be something else, then copy from the backup to the file. I don’t think you can do that from inside Gimp. You can do it from Windows. (I would use a command console, but you might prefer an Explorer window.)
my apologies, I was being dumb at the time…should have erased that! I think I have it down by using 7-zip…but thank you for answering anyway!