Go to Downloads to download the patch.

Firstly check you have the latest version of java: click here to check (java.com)
This will download and run an installer, if you have the latest version of java then you wont need to install any thing. If you don't then you will need to install the update, or the full version if you don't have java on your PC.
Once you have java up to date download the latest auto patching software from below.

When you click one of the links above you will be asked to save or open. Click save and save to your desktop:

Once the download is finished (about 4 seconds), locate it on your desktop, right click, click open with, compressed (zipped) Folders:

This will open up another box like this:

Double click the folder called auto patch and you will see this:

These are the 2 files that you need to put in your Mir folder. Leave the above window open while you do the next step.

Find your Mir folder. To find your Mir folder you need to find you Mir shortcut, 9 times out of 10 this is on the desktop. The Mir shortcut is the icon you double click to access the game. Find your Mir shortcut, right click on it then select properties:

You will then see this screen:

Click on find target and this screen will appear:

Your Mir folder might have some more icons in it, but it will have at least the 5 above in it.

Now all you need to do is, go back to the 1st window

Then copy and paste the contents into your Mir folder. If you have done this right your Mir folder will now look like this:

Now double click the icon called Mir Revenge Auto Patch, wait a few seconds and you will see this screen:

The auto patch software will scan all the files on the server and compare them to the files on your PC. Once it has done this it will show you this box:

Mines says 9247 files as I was doing a full install. Once you click OK the software will start to download all the updates for you. As soon as the updates have finished download, run Mir Revenge like you would normally.