Hi, I noticed some workstations upgraded agent to 22.3.738, but most of them is still on 22.2.729. Anything I can do to force upgrade (except manual installation 
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Not all customers are being upgraded to the latest agent version at the same time. AVAST typically distributes the upgrade into a few days to mitigate the risk of potential issues. So for auto updates, it may sometimes happen that 2 versions are both considered “laters” for a short period of time.
There is no way to force the agent upgrade.