How to install the Infected mod on L4D2 Demo.

(English follow.)

Common problems are:

If you can't open a "Console", please read the step 4 of the following.
If you have been encountering the "Unknown commands", please read the step 7.

Steps:
1. Download the ZIP file from the following site.

http://www.l4dmods.com/index.php?option=com_content&view=article&id=282:play-as-infected-with-the-left-4-dead-2-demo&catid=2:news&Itemid=13

2. Extract the ZIP to \Steam\steamapps\common\left 4 dead 2 demo\left4dead2
3. Launch a Left 4 Dead 2 Demo.
4. Change the "ALLOW DEVELOPER CONSOLE" option to "Enabled" in OPTIONS / Keyboard/Mouse.
5. Start a Single Player mode. (or Online)
6. Press ~ key to open a "Console" window after you can control your character.
7. Type in "plugin_load serverplugin_multihack" to load the mod plugin in "Console".

Then, the loading message will be shown.

8. Type in "plugin_cvar sb_all_bot_team 1" in "Console".

Then, "Set ConVar ...." message will be shown.

9. Type in "plugin_allow_remote_commands 1" in "Console".
10. Type in "set_infected 1" to switch the mode to Infected mode.

Then, "Making (username) infected..." will be shown.
(If you want to switch the mode to Survivor mode, type in "set_infected 0".)

11. Press Esc key some times. Or click a "RETURN TO GAME" button.

Then, start the infected mode.

Enjoy hunting!

Regards :)