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The CloudFormation deploys ok in my testing (again just now).
1/ make sure you copy both the sec-hub-email.zip and the security-hub-email-summary-cf-template.json (2 files) into the S3 bucket
2/ The S3 Bucket name is just the name 's3-bucket-with-your-files'
3/ the S3 key name doesn't need a prefix path if you don't have prefixes. (that might be confusing from the blog screenshot). If I uploaded the zip right into the bucket without creating any folders, the value 'sec-hub-email.zip' is all that you would put into that parameter.
4/ make sure you accept (click the check box) that CloudFormation might create IAM resources.
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