I currently run PSE 2019 on my Macbook. Yesterday, the automatic PSE update feature indicated an update was available and I consequently had it installed by the related PSE installer when I quit PSE. The next morning my Mac would not start. Although I eventually managed to get my Mac going, I suspect that the PSE update installer does not request nor check if an anti-virus application is active and consequently needs to be shut down before the installation begins. I suspect the AV (Kaspersky in my case) detected a application change during startup and would not permit completion of the startup. Shouldn't deactivating an AV application be standard during any update?
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