Mac OS

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Ditto with Gordon. No problems whatsoever. I always, though, wait at least two or three months before installing a major new release of the Mac OS. This gives Apple time to smooth out all the inevitable bugs found in a new release, and allows software developers to do the same. I got my first Mac in 1985, and this philosophy has saved me countless hours and much aggravation over the years. You don't want to fall too far behind in OS releases, but I'm not interested in being a beta tester, either, when I have work to get done. Catalina has been around long enough to be completely stable and reliable.
 
I too am using Mac OS Catalina (v10.15.7) on my iMac & MacBook Pro with no issues with PS 2020. When a new OS is out I usually never update immediately. I normally wait till other companies have updated their software to run on the new OS, especially for photo editing, printing & scanning.
 
I’m a windows user so perhaps not the best to answer, but it also depends on the software you’re using. I’m aware Capture One has a problem with Big Sur, so it’s probably a good idea to check for compatibility issues with your programs and if there’s an issue wait for it to be resolved first.
 
Ditto with Gordon. No problems whatsoever. I always, though, wait at least two or three months before installing a major new release of the Mac OS. This gives Apple time to smooth out all the inevitable bugs found in a new release, and allows software developers to do the same. I got my first Mac in 1985, and this philosophy has saved me countless hours and much aggravation over the years. You don't want to fall too far behind in OS releases, but I'm not interested in being a beta tester, either, when I have work to get done. Catalina has been around long enough to be completely stable and reliable.
I totally agree Birddog. I’ve been using Macs since 1986 and follow the same advice. You must also check websites of software you use. I always do a web search as well to see if anyone has reported major issues.
 
I should have mentioned one very important issue: Mojave was the last Mac OS that will run 32-bit applications. Catalina will not. If you depend upon any old 32-bit software, be sure to research 64-bit upgrades or substitutes, because the old ones won't work. I used a simple free app called Go64 (https://www.stclairsoft.com/Go64/) that identifies any 32-bit apps on your machine. This Apple support article (https://support.apple.com/en-us/HT208436) also describes how to identify legacy apps.
 
I should have mentioned one very important issue: Mojave was the last Mac OS that will run 32-bit applications. Catalina will not. If you depend upon any old 32-bit software, be sure to research 64-bit upgrades or substitutes, because the old ones won't work. I used a simple free app called Go64 (https://www.stclairsoft.com/Go64/) that identifies any 32-bit apps on your machine. This Apple support article (https://support.apple.com/en-us/HT208436) also describes how to identify legacy apps.
After doing what Birddog suggest and you find that there is no 64 version, Another option would be to have a second startup disk and retain Mojave on that one . If there is an app that you love and there is no 64 bit update to it run the 32 bit app on the Mojave Drive.
 
After doing what Birddog suggest and you find that there is no 64 version, Another option would be to have a second startup disk and retain Mojave on that one . If there is an app that you love and there is no 64 bit update to it run the 32 bit app on the Mojave Drive.
Or you could get virtualization software like 'Parallels' or 'VMFusion' and install Mojave on it. That way, you can run both Mojave and Catalina/Big Sur without neeing to re-boot your computer.
 
@Ralph Bruno @Nick B. you are both correct and like everything there are pluses and minuses to each... Do you have two separate disks drives, so you always have one incase the other one fails... do you have enough HD space to run two systems... How do you back each of these systems up.. It's a slippery slope because everyone is different. But both are options... Just like keeping an older Mac with older software.

My personal experience is the theory of using a 32 bit app is nice but in the end you will get tired of the hoops you have to jump though to use it as well as the performance will continue to decline as images/ files/ Documents/ insert whatever, get larger and larger. if there is an app that is currently 32 bit and they are not updating it, there is a really good chance there is something else out there

We have a lot of legacy programs at work and they are all a big pain in the behind, are painfully slow... and hardly used.
 
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One other thing think about for Mac users is that Lightroom 6 perpetual licence will not run on IOSCatalina, unless you have installed LR6 on Mojave or earlier and before tour system upgrades to Catalina upgrade because of the lack of 32 bit support in Catalina. This forces you to take the monthly or annual creative cloud subscription for Lightroom Classic etc. PS 2020 runs fine as it’s part of the Creative cloud pack
 
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While I don't use it, Apple's Photo app improves with nearly every OS upgrade and is free. I been using PhotoShop for many years and now subscribe to it so the application is always updated. It is wise to use the latest MAC OS unless you don't want to upgrade 32 bit applications. I also have learned to wait a few months to load Apple's latest major OS upgrade. On the other hand, some of Apple's "improvements" are not very useful or convenient and there is often a learning curve to go through.
 
One other thing think about for Mac users is that Lightroom 6 perpetual licence will not run on IOSCatalina, unless you have installed LR6 on Mojave or earlier and before tour system upgrades to Catalina upgrade because of the lack of 32 bit support in Catalina. This forces you to take the monthly or annual creative cloud subscription for Lightroom Classic etc. PS 2020 runs fine as airy if the CReative cloud pack
Looks like your last sentence 'got away from you' :)

My understanding is that the perpetual LR 6 will run under Catalina (it is 64 bit) but that the installer will not run. So you are stuck unless you install LR 6 before upgrading. You are also stuck if you need to do a re-install of LR6 after Catalina is installed. I believe that this applies to all of the Adobe perpetual license software packages, not just to LR.

It is interesting that Aperture is a 64 bit programme (accodring to the check I just ran on my system). I wonder if it will continue to run under Catalina and Big Sur?
 
Gordon's assessment is right on, in my experience. I was worried about losing access to a number of familiar 32-bit apps when I went to Catalina, but I soon found I didn't miss them. If a developer didn't feel compelled to modernize their 32-bit version to 64, chances are that app's effective days were numbered, anyway. I actually saved some money, because I refused to pay Microsoft for their 64-bit Office subscription. Apple's free Pages, Numbers, and Keynote replace Word, Excel, and Powerpoint quite nicely, and export to Word/Excel/Powerpoint seamlessly for non-Mac users. I am not a LIghtroom user, but I remember when Adobe went to their subscription plan, they promised to support Photoshop 6 (I think that was the last pre-subscription version). That promise did not last very long. I would not hang my hat on Adobe supporting LR 6 forever, but that is just my opinion. The days of being able to use an app for years across multiple OS upgrades are essentially gone...by design, I suspect. Falling too far behind in OS and application releases results in more wasted time and frustration than any $ savings are worth, at least for me. We're all over a barrel these days with more and more software companies adopting the subscription model. It's just a matter of how large a barrel we can afford.
 
Something that the Mac OS makes incredibly easy is to have a second drive setup as a backup boot drive and boot from it if there are any problems. When I had a Mac workstation I would back up the primary boot drive to the secondary drive and then boot from the second drive to verify everthing was OK. If updates to the primary boot drive created a problem then I could boot off the second drive and not lose any time. I could then backup the second drive to the first to restore the state of the primaty drive.
 
Something that the Mac OS makes incredibly easy is to have a second drive setup as a backup boot drive and boot from it if there are any problems. When I had a Mac workstation I would back up the primary boot drive to the secondary drive and then boot from the second drive to verify everthing was OK. If updates to the primary boot drive created a problem then I could boot off the second drive and not lose any time. I could then backup the second drive to the first to restore the state of the primaty drive.
Mac OS makes it incredibly easy to have multiple boot up drives.
 
Using OS 10.15.7, latest one. Also using the newest Adobe software. No problems. My computer: iMac (Retina 5K, 27-inch, Late 2015). My processor: 4 GHz Quad-Core Intel Core i7.
 
I use Catalina and can't load my new D6 photos to Apple photos. It's a free and easy sorting/post process software. I keep calling both Nikon and Apple = nothing yet. I do use LR cc but it takes longer.
 
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