When upgrading to Terraform 0.13 where runs driven by VCS and state is stored remotely (in this case Terraform Cloud)
I had an issue where a public Github module I was using included versions.tf which fails on older terraform versions.
I'd never used terraform locally, only connected the repository to Terraform Cloud.
The terraform 0.13upgrade is only in the 0.13 binaries, I had to download the old binary for my OS and run that specifically.