Hi Col Hogan and welcome to Gimp Chat.
Many of the older scripts may not work in GIMP 2.6.
You can find many of the updated scripts here.
http://gimpfx-foundry.sourceforge.net/browse26/index.htmlAs far as the script folder location is concerned, in Windows usually .gimp-2.6 scripts folder is located somewhat here. I don't use Windows so I have forgotten the exact location.
C:/ ... there might be another folder here ... /Documents and Settings/<your name>/.gimp-2.6/scripts
Be sure hidden files and folders are unchecked in the folder options.
Be sure to return if you have any more questions.
Good luck!!
You may want to give your older scripts a try first before getting the new ones. They will certainly let you know if they don't work in 2.6