BLZBNTBNA0000000C Couldn't verify your digital signature

Technical Support
Couldn't verify the digital signature of your Battle.net Agent. Won't load the Battle.net app.

The article it points me to is supremely unhelpful.

Restarting doesn't help and if I try to reinstall the app it gives me the same error and won't install it.

Pretty cool since I could play last night and all I did was go to work and didn't touch my computer.
How did you solve this? I keep having this issue and can't play since Wednesday

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