Automatic Updates not taking; Must manually update every workstation

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I got a report from Avast about previous versions that haven't been updated. It said:

"Old program versions are still active within your network. The list of computers is:"

And then listed dozens of PCs that haven't updated to the newest version. How can I get these to all update at once?

EDIT: Solved. Went into each PC group, clicked settings, updates --> Automatic Updates.