I'm unable to check step 2: Automate Accounts because I'm receiving this error: Challenge Not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: ZKCVFIZH
 

I tried in my DE in Lightning, Classic, and followed the install package article directions opening an icognito window. Still cannot get the package to show or install? Anybody know what the issue is? Thank you!