아두이노 우노 종합편을 샀는데요. 

예제코드에서 hello world가 시리얼 모니터에 뜨는 코드를 업로드를 시켰는데 한참 업로딩중이라고 뜨다가 

아두이노:1.8.13 (Windows Store 1.8.42.0) (Windows 10), 보드:"Arduino Uno"

스케치는 프로그램 저장 공간 1468 바이트(4%)를 사용. 최대 32256 바이트.

전역 변수는 동적 메모리 198바이트(9%)를 사용, 1850바이트의 지역변수가 남음.  최대는 2048 바이트. 

다운로딩 에러 https://downloads.arduino.cc/packages/package_index.json

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x91

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x91

보드에 업로딩중에 문제 발생. 다음을  참고하세요. http://www.arduino.cc/en/Guide/Troubleshooting#upload

이렇게 떠요.