Our Workflow Manager certificates are expired since Monday last week. Therefore our 2013 workflows, which we and our customers use a lot in our productive SharePoint environment, don't work anymore. I can't renew the certificates, because the Workflow Manager became unresponsive after the expiration date of the certificates. I tried accessing the configuration via the Workflow Manager executable, which just crashes on start and via PowerShell which prints out the following error: "Certificate requested with thumbprint ... not found in the certificate store". How can I update the certificates to get back to a working Workflow Manager?
One probable solution I found, is installing the CU4 for Workflow Manager 1.0 (https://support.microsoft.com/en-us/help/4019220/description-of-the-cumulative-update-4-for-workflow-manager-1-0) - one of the features added in this update is "Additional support for renewing the expired certificates used in Workflow Manager farm". Can I install an update to the Workflow Manager if the certificates are expired?
Are there any other solutions?