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This I guess is the extra layers of security Apple has built in,
That's it exactly but there's a new wrinkle:

Unverified apps will now give you only two choices, Cancel or Trash if you double-click to open. You can't make them trusted — which doesn't mean there isn't a workaround: Right-click (or whatever method you use to open the Secondary menu) and select Open — this brings up another menu that gives you a third choice: open anyway and assume the risk. Once you do that, your Mac will remember this and open the app as usual.

I discovered this with the open source LibreOffice.

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I am leaving the update to Catalina on my iMac...
With me, it's my 2012 MBP that's running Catalina. I make my living on an iMac Pro and that's the one that gets to wait till a number of apps are updated—some, by the developers; others, after I spend the "Dough for the Do-Re-Mi" (1970s BMI slogan but I like it even though I'm ASCAP)


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Amplitube 3 and Custom Shop (IK Multimedia)
Amplitude 4 and the current Custom Shop are 64 bit but that doesn't matter. The License Manager is still 32 bit — until that's fixed, IKM plugs and VIs won't work in OS 10.15.


BIAB 2023 Audiophile, 24/60 Core M2 Mac Studio Ultra/8TB/192GB Sonoma, M1 MBAir, 2012 MBP
Digital Performer 11, LogicPro
Finale27.4, Dorico5, Encore5, SmartScorePro64, Notion6, Overture5