You can't literally install (just) the patch. You basically have to
compile the effected plugin and create a feature patch. Kind of
complicated ... but, you wanted to learn more about it, you might start
If you are doing this "just for yourself", you can do it all from your
workspace, making sure you have a PDE target consisting of the exact
version of WTP you want to patch. (patch features are, as far as I know,
always for any exact version of the features/plugins to be fixed.