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I just bought 3 of these that work well with this library LiquidCrystal_I2C2004V1.zip
(License: CC BY-NC 2012 http://www.wikispaces.com/user/view/TerryKing ).

When installing this library in Arduino IDE (version 1.6 or later), use menu item Sketch | Include Library | Add .ZIP Library..., navigate to the folder where LiquidCrystal_I2C2004V1.zip was downloaded, and then open the zip file.

Use the I2C address in the example "HelloWorld" supplied with LiquidCrystal_I2C2004V1:

//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
 lcd.init(); // initialize the lcd 
 lcd.init();
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(3,0);
 lcd.print("Hello, world!");
 lcd.setCursor(2,1);
 lcd.print("Ywrobot Arduino!");
 lcd.setCursor(0,2);
 lcd.print("Arduino LCM IIC 2004");
 lcd.setCursor(2,3);
 lcd.print("Power By Ec-yuan!");
}
void loop()
{
}

Do not change the other library directory name; this one is compatible with the existing library. Just add it as a contributed library.

Edit: consolidate comment and other answer from @Brent Mesler http://arduino.stackexchange.com/a/5006/7174 into a single answer.

I just bought 3 of these that work well with this library LiquidCrystal_I2C2004V1.zip
(License: CC BY-NC 2012 http://www.wikispaces.com/user/view/TerryKing ).

When installing this library in Arduino IDE (version 1.6 or later), use menu item Sketch | Include Library | Add .ZIP Library..., navigate to the folder where LiquidCrystal_I2C2004V1.zip was downloaded, and then open the zip file.

Use the I2C address in the example "HelloWorld" supplied with LiquidCrystal_I2C2004V1:

//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
 lcd.init(); // initialize the lcd 
 lcd.init();
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(3,0);
 lcd.print("Hello, world!");
 lcd.setCursor(2,1);
 lcd.print("Ywrobot Arduino!");
 lcd.setCursor(0,2);
 lcd.print("Arduino LCM IIC 2004");
 lcd.setCursor(2,3);
 lcd.print("Power By Ec-yuan!");
}
void loop()
{
}

Do not change the other library directory name; this one is compatible with the existing library. Just add it as a contributed library.

Be sure to open the zip file from the "add library menu". I just bought 3 of these that work well with this library:http://arduino-info.wikispaces.com/file/detail/LiquidCrystal_I2C2004V1.zip

Use the I2C address in the example "helloWorld"

I just bought 3 of these that work well with this libraryLiquidCrystal_I2C2004V1.zip
(License: CC BY-NC 2012 http://www.wikispaces.com/user/view/TerryKing ).

When installing this library in Arduino IDE (version 1.6 or later), use menu item Sketch | Include Library | Add .ZIP Library..., navigate to the folder where LiquidCrystal_I2C2004V1.zip was downloaded, and then open the zip file.

Use the I2C address in the example "HelloWorld" supplied with LiquidCrystal_I2C2004V1:

//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
 lcd.init(); // initialize the lcd 
 lcd.init();
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(3,0);
 lcd.print("Hello, world!");
 lcd.setCursor(2,1);
 lcd.print("Ywrobot Arduino!");
 lcd.setCursor(0,2);
 lcd.print("Arduino LCM IIC 2004");
 lcd.setCursor(2,3);
 lcd.print("Power By Ec-yuan!");
}
void loop()
{
}

Do not change the other library directory name; this one is compatible with the existing library. Just add it as a contributed library.

Edit: consolidate comment and other answer from @Brent Mesler http://arduino.stackexchange.com/a/5006/7174 into a single answer.