Seeeduino Cloud and Grove IoT Starter Kit Powere Link broken

we used for Grove aws IOT start kits. … red_by_AWS
But inside the wiki to download root.cert is broken:
3 .Download the AWS IoT CA file from 3-Public-Primary-Certification-Authority-G5.pem here. And save it as root-CA.crt.

and I search internet cannot find the answer other where.
It makes my start kit cannot talk to aws IOT. I need return the product back to amazon.
Please help to solved asap.