I have been advised to continue this discussion here. https://github.com/hashicorp/terraform/issues/23458
I tried:
2019/11/25 01:36:56 [INFO] Terraform version: 0.12.16
2019/11/25 01:36:56 [INFO] Go runtime version: go1.12.13
2019/11/25 01:36:56 [INFO] CLI args: []string{"/usr/local/bin/terraform", "--version"}
2019/11/25 01:36:56 [DEBUG] Attempting to open CLI config file: /Users/gliartecano/.terraformrc
2019/11/25 01:36:56 [DEBUG] File doesn't exist, but doesn't need to. Ignoring.
2019/11/25 01:36:56 [INFO] CLI command args: []string{"version", "--version"}
Terraform v0.12.16
2019/11/25 01:36:56 [DEBUG] checking for provider in "."
2019/11/25 01:36:56 [DEBUG] checking for provider in "/usr/local/bin"
2019/11/25 01:36:56 [DEBUG] checking for provider in ".terraform/plugins/darwin_amd64"
2019/11/25 01:36:56 [DEBUG] found provider "terraform-provider-aws_v2.36.0_x4"
2019/11/25 01:36:56 [DEBUG] found valid plugin: "aws", "2.36.0", "/Users/gliartecano/workspace/git/ebsi-network/ebsi1_orchestration/base/.terraform/plugins/darwin_amd64/terraform-provider-aws_v2.36.0_x4"
+ provider.aws v2.36.0
2019/11/25 01:36:59 [ERR] Checkpoint error: Get https://checkpoint-api.hashicorp.com/v1/check/terraform?arch=amd64&os=darwin&signature=fcc0431b-ff6a-ab58-73e3-c9ed18233eb0&version=0.12.16: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
real 0m42.646s
user 0m0.473s
sys 0m0.179s
Any other cli application installed comes back within reasonable time.