When running software update from the Help menu the system returns with a message saying that the software signatures don’t match.
This error can happen if you are using versions of BlackFog prior to 3.5.1 which introduced a certificate change to the main application to support Microsofts new signing policies. The solution is to uninstall BlackFog from the Control Panel > Programs and Features. Then download the latest edition of BlackFog from:
https://www.blackfog.com/downloads
Then proceed with the normal installation. All settings and and licenses will be preserved and the update will now continue to work as before.