]/spoiler]
Then open the location of where your brushes are stored
on windows these are located at -
C:\Program Files\GIMP-2.0\share\gimp\2.0\brushes
Highlight and select the brushes that you have downloaded
they are usually in a .zip or .rar
Then drag them into your brush directory, they will then start
to be copied.
As you can see from the image bellow, the brushes have been
copied, to know if yours have been copied or not, check the names
of the brushes in the directory.
Now when you open up GIMP you can use these brushes.
Hope this tutorial helped anyone whom needed it