I wish my Mac was compatible with Sidecar, I just missed out 
Oh there’s a cut off? I may be out of luck. I think mine is mid 2015 MacBook Pro.
Only MacBook Pro 2016 on wards I think.
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Will think about putting on my 2017 MacBook Pro.
Hmm… Catalina has been “Estimating time remaining” for just under 3 hours. This seems to be acceptable to those that know about these things. R-
Mine was like that too - eventually updated, though… 
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I have so many Steam games that are 32 bit (that I’ve not even played yet!). Looks like I’m going to have to dual boot my Mac if I want all the shiny new Catalina goodness.
After about 8 hours it looks as though the progress bar is moving, albeit slowly. R-
Are you using a super old computer or an actual HDD? Mine took nowhere near that long to update.
It’s a 2014 purchase - so getting on a bit. I think part of the problem [from what I’ve read] is the backup, which apparently I should have done just prior to kicking it off. I didn’t worry about it at the time as everything is backed up to an external WD hard drive which I imagined would be sufficient. R-
Well the update finished after about 10 hours and then I got stuck on “Setting up your Mac”. Both are well reported on the WWW - and the solution for the last situation at least is to force a reboot [power cycle]. This I have done and now I am “Preparing to Import Mail Messages”. Without doubt - for me - the worst Apple update I have encountered. R-
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Left mine downloading last night. Had been saying ‘in a minute’ for about an hour, so closed the lid and went to bed. Will see what state it’s in when I get home.
I’ve been on the BETA though, and have to say that I do like some of the new features. Files (once they let use share them in March next year) and new Reminders mean I have stopped paying for Dropbox and Todoist!
I had the same issue, stuck on “setting up your mac” I left it about an hour and then force reboot the device.
All seems fine now.
The actual update only took about an hour to install for me (Macbook Pro 2015).
I will stop banging on about this - shortly. The Importing mailbox dialogue now informs me that my 1,080,120 messages from Gmail will take approximately 9 hours 36 minutes to download. Luckily I have three other devices on which to deal with email and, being retired, none of it is life threatening or revenue critical. R-
OK - last word from me. If you get stuck on the Importing Mailbox issue go to System Preferences > Internet Accounts and delete the email account giving you the problem. Wait a few seconds and reinstall it. This from Apple Support - way above my pay scale. R-
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Anyone here traded-in a mac? I’ve kept mine in perfect condition and accidentally bumped it with the top of my monitor trying to disconnect it earlier, now has a kinda noticeable dent and scratch on the top - actual functionality isn’t affected at all. Would that disqualify it?
I wonder if macOS 15.0.1 will fix this obvious Screen Time bug:
As well as actually being asleep until after 6am, I didn’t start using it until at least 8am.
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I’m having some issues with my Thunderbolt dock with MacOS 15.0.1 as well. When I wake up my Mac, I need to unplug the USB-C cable and plug it back in for the display to start working 
Hoping for an update that fixes it soon.
I’ve never really been a coder; scripter, definitely (perl, bash, etc.).
I used to have to configure Cisco routers to do challenging things and I remember once coming up with part of an IOS config in a dream 
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Anybody running the macOS 15.4 RC? Apple have done something odd with Safari, unless my installation is somehow broken. Bitwarden no longer fills on some websites - in fact it just shows a blank window with a spinner. I can’t remember which websites right now but will add them in this thread when I come across them again.
The main problem I’ve noticed, though, is with YouTube. If you right-click on a video and “Open link in new private window” then it just opens the main YouTube page in the private window and not the video itself.
This all worked with macOS 15.3.