We have tracked the root cause down to an upstream issue with Cloudflare which we use https://www.cloudflarestatus.com/incidents/46z55mdhg0t5
For the moment, this issue is mitigated on our end. However, we are seeing errors for other domains (such as node.js) and believe this might be a wider Internet connectivity issue. As a result, inspections that install a node.js version are currently failing.
We are further investigating how to minimize the impact this has on your inspections and we will keep you updated here.