DFRobot_HT1632C

I'm trying to run a test program downloaded from this site:

#include "DFRobot_HT1632C.h"

#define DATA D6

#define CS D2

#define WR D7

//#define RD 7

DFRobot_HT1632C ht1632c = DFRobot_HT1632C(DATA, WR,CS);

char str[] = "Hello";

void setup() {

  // put your setup code here, to run once:

  ht1632c.begin();

  ht1632c.isLedOn(true);

  ht1632c.clearScreen();

    ht1632c.setCursor(0,0);

  ht1632c.print(str);

}

void loop() {

  // put your main code here, to run repeatedly:

}

, but I'm continuing to receive always the same error, below:

C:\Users\andrea.morselli\Documents\Arduino\testmatrix\testmatrix.ino:1:10: fatal error: DFRobot_HT1632C.h: No such file or directory
   1 | #include "DFRobot_HT1632C.h"
     |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1

Compilation error: DFRobot_HT1632C.h: No such file or directory

Someone can help me?