Upright-girl hi,
It will say 2.0 in the Gimp folder. I also have the 2.6 version of Gimp. If you want to know where your plug-in folder(s) are, just select:
Edit | Preferences from a Gimp Image Window.
The Preferences Dialog Window will open.
On the left side, you will see various label headings, which you can click on and then make various adjustments. Towards the bottom of that list you will see one marked Folders.
Just expand that section and find the one that is named Plug-Ins and click on it.
On the right, you will see a section showing you the path to your plug-in folders. Generally there is a local one. It usually involves some path including your user name. Then there is the global one. For example, my global path for my plug-in folder is /usr/local/lib/gimp/2.0/plug-ins (I use the GNU/Linux OS, your path will look different if you are using Microsoft Windows).
Hope this helps you some.