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Patching on Windows is simple. Just download the latest patch and run it, making sure to give the patching program the path to your old Monster 2 installation. These patches should work from any version to any version so grabbing the latest patch should always work.
Patches for OS X must be applied in sequence, from oldest to newest. In other words, if you have Monster 2 version 1.0 installed and the latest patch is 1.0p2, you'll need the 1.0p1 and the 1.0p2 patch and you'll need to apply them in that order. First, download the patch. Next, open a terminal (Utilities->Terminal). From your home directory, type into the terminal tar xf path/to/Monster2-patch-1.0_to_1.0p1-macosx.tar, replacing path/to with the directory of the downloaded patch, and the filename with the actual filename of the patch. Now type cd Monster2-patch-1.0_to_1.0p1-macosx and finally sudo ./runme.sh /path/to/Monster2.app, replacing /path/to/Monster2.app with the full path to Monster2.app (which would be /Applications if you stored it in your Applications folder. Give your password when asked. Repeat for each patch you have to install.
Linux patches, like Mac OS X patches, need to be applied in order and you cannot skip a patch.
First, open a terminal and change to your Monster 2 directory (usually named monster2-linux). From there run ./patchgame <path/to/patch>, replacing <path/to/patch> with the full path and filename of the patch you are applying, for example ./patchgame ~/Monster2-patch-1.0_to_1.0p1-linux.tar.gz. Repeat for all the patches you have to apply.