You can find it by googling for Wanna Cry patch on Windows XP. And you can download the patch using any browser, you don't have to use Internet Exploder. The patch file has the longest filename I ever saw, just to make things hard for us users. Thanks M$. windowsxp-kb4012598-x86-custom-enu_eceb7d5023bbb23c0dc633e469c2f14fa6ee9dd.exe. Don't try to google for that, it's too long to type correctly. Google for "Wanna Cry patch windows XP".
M$ decided that Wanna Cry was so bad that they released a patch for XP, which they have declared obsolete, dead as a doornail, and windows update no longer works on XP. Too bad. Of the various flavors of windows, XP is the fastest, the smallest, and can do everything the newer flavors of Windows can do, and do it faster. A lot of us still run XP, cause the newer and fatter versions won't run on our elder but still very capable computers.
If you are running one of the newer, slower, and fatter versions there are special versions of the patch for use on them. M$ brags that windows update will have automatically patched the newer versions. You can believe as much of that as you want to.
Now, to see if the patch actually works. It doesn't seem to a broken anything. Only time will tell if it stops the Wanna Cry virus.
The Wall St Journal says law enforcement world wide is looking for the Wanna Cry perps. If the cops catch them, I can think of some cruel and unusual punishments that would fit the crime.