After hours of searching on Internet without success I finally find out how to import library in Arduino IDE to work properly. I will write it down so you don't need to lose couple of hours on search without results.Firstly, internet is full of advice and ways how to import library in Arduino but for me none of these doesn't work.
After I tried import library in the way to copy downloaded library into Arduino libraries as internet says. I got errors like this:
multiple definition of `LiquidCrystal_I2C::pulseEnable(unsigned char)'
LiquidCrystal_I2C.cpp.o:...
