If you have an iMac 17,1 (Retina 5K, 27-inch, Late 2015), updated to the latest version of Catalina (released Tuesday), post your EFI version here so we can get more data. This information is. IMac Late 2015 onwards, iMac Pro, MacBook Early 2016 onwards, MacBook Air 2018 onwards, MacBook Pro 2016 onwards, Mac mini 2018 onwards, Mac Pro 2019. That seems more brutal than usual, particularly with MacBook Air and Mac mini models, and it’s possible that the next round of firmware updates in macOS 11.5 might redeem some older models. Mac mini (Late 2012 to late-2018) iMac (Late 2012 to mid-2017) iMac Pro (all models) Mac Pro (Late 2013, plus mid-2010 and mid-2012 models with recommended Metal-capable GPU) High Sierra compatibility. This means you will need a late 2015 iMac 27-inch or newer, 2016 MacBook Pro or newer, 2018 Mac Mini, 2019 Mac Pro, 2018 MacBook Air, or an early 2016 MacBook or newer model computer. Mavericks - OS 10.9.x Yosemite - OS 10.10.x El Capitan - OS 10.11 Sierra - OS 10.12 High Sierra - OS 10.13 Third, you need to be concerned about any third party software you are using, and most likely, will need either to upgrade some/most/all of them to be compatible with the OS you want to move to, or possibly some of them might not work at all.
macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.
Check compatibility
macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you may be able to install an old version of macOS instead.
MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.
If you're upgrading from macOS Sierra or later, your Mac will need 35.5GB of available storage to upgrade. If you're upgrading from an earlier release, your Mac will need up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.
Download macOS Big Sur
If you're using macOS Mojave or later, get macOS Big Sur by Software Update: choose Apple menu > System Preferences, then click Software Update.
Or use this link to open the macOS Big Sur page on the App Store: get macOS Big Sur. Then click the Get button or iCloud download icon.
Install macOS Big Sur
Is A 2015 Imac Still Good In 2020
After being downloaded, the installer will open automatically. Click Continue and follow the onscreen instructions.
Please allow the installation to finish without putting your Mac to sleep or closing its lid. During the installation, it may restart and display a progress bar or blank screen several times. You may find it easiest to start installation in the evening so that it can be completed overnight, if needed.
Is Imac 2015 Upgradable
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Imac Late 2015 Os Update Problems
After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. To check for updates, choose Apple menu > System Preferences, then click Software Update.