Aleon,
You should not delete the sysVault - that’s where your ACME account keys are.
Version 2 of the script is ready and fixes the renewal issues as well as the support for Exchange 2010. We are adding a wizard script, which simplifies checking status, generating the script with your data (of course, you can still do this manually as demonstrated in the video), schedules/checks/changes the renewal.
The wizard script is not complete yet, but if you are in a hurry, I can provide you with the updated v2 script via a PM.