Tools: windows 10, keil 4, proteus7.8
Here we are using a software localization
After opening keil is blank interface, it is necessary to build the project, first click on the menu button inside the project, pop-up dialog box.
Create a new name for the example project that is saved on the desktop firstproject folder.
After you save the pop-up box, select the desired item microcontroller chips. Choose one of the "Atmel", click on "Atmel" in English in front of the "+" symbol, select "AT89C52", click "OK" Click "Yes."
New file, click on the top left of the "File" and select "New" to create a new file. Then click on the "File" menu, select "Save" dialog box, select the location to save the new file named "example_led.c". File name does not matter, but there must be ".c" suffix.
Add File (new example_led.c files) to the project, click the "progenitor 1" folder, right-click and select "Add files to source group 1 ..." dialog box, select New to add a example_led.c file, click "Add" to finish adding click "Close" to close the window. As shown below:
Programs written in English
The red block check the
Check the input program correctness, then click the top left of 
the three buttons, the following figure appears to prove there is no problem
Next simulation, find the "Embedded C Programming Language" circuit diagram of the total open circuit simulation, written before clicking microcontroller selection procedures, start simulation
Analog success