Run the installer, and use it to install High Sierra on the internal drive. It should be about 5.2GB large. Go to the Mac App Store and redownload the 'Install MacOS High Sierra' application. Use Disk Utility to erase and reformat the internal (OWC) drive.If you manage to get past the ‘ An error occurred while installing the selected updates‘ popup and actually download the macOS 11 update package, there is a high probability that you’ll get stuck at the ‘There is not enough free space on the selected volume to upgrade the OS!’ error dialog box! macOS Big Sur Storage RequirementsBelieve it or not macOS Big Sur requires an astonishing 46,01 GB of storage space on your Mac. Upgrading to macOS Big Sur can prove to be quite a challenge especially if you’re trying to do it now as soon as it was released. NOW, click on each partition block in that window on the left.Once your older Mac OS X CD or DVD is in your hand, set aside some time with Disk Utility and some blank CD-Rs, DVD-Rs, or, in the case of the Mac OS X 10.5 Leopard and Mac OS X 10.6 Snow Leopard. Click the box to Install Mac OS 9 Drivers. Click the Volume Scheme drop-down, and change to 2 Partitions. Note: Some macOS users report when upgrading from version 44 to 45 of Drive for desktop a Keychain Not Found error.How to fix macOS Big Sur not enough storage to update!The screen shot in that Apple article is from an older version of Disk Utility, but the main help for you is to choose the drive (not any partition), then click the Partition tab.( System, Apps, Mail, Documents, iCloud Drive).To solve this problem and manage to install macOS 11.0.1 on our machine we have applied the following tricks to free up space: 1. Hover with the mouse over each segment, on the storage bar, to find out what type of files are using the most storage on your computer. Click on Storage, in the horizontal menu, next to Displays. Click the Apple logo, in the top-left corner of the screen. But the macOS Big Sur install screen claims that I need to free up an additional 27,43 GB! How To Check For Available Storage Space On MacTo be efficient when trying to create additional free space you need to know what files are the biggest storage consumers on your Mac. That’s a huge amount of space especially for Mac owners that are limited to 128 GB!As you can see, in the screenshot updated nearby, our Macbook Air already has the 12,18 GB large macOS Big Sur update file downloaded and there are 7,4 GB extra available.
![]() Missing Disk Mac App StoreApps that are using the most storage space are listed at the top. Tap on Applications, available in the left sidebar, in the Manage Storage screen. Although macOS Big Sur requires a total of more than 46 GB for the update to complete, a large part of this space is freed up at the end of the process. You can delete even the ones that you use often, because you can re-install them back after you finish updating to macOS 11.0.1. Delete AppsAnother way to free up storage for macOS Big Sur is to delete apps on your Mac. Opt for Delete from Mac, to confirm that you want to delete low-resolution photos and videos will be removed from this Mac.Tip: Check out the Apple One subscription bundle that’s a great option if you use multiple Apple services. No worries, you will be able to download them back as soon as the macOS Big Sur installation completes. Delete MusicIf you store songs and albums on your Mac, you might as well want to delete them because they can be serious storage consumers. Select all files with Shift + Down Arrow and use the Delete… button available in the bottom-right corner of the screen.Tip: You can export them to an external storage drive, if you want to be sure that you have a copy. In the same Storage Recommendations screen, click on Messages. You can delete almost anything else: Adobe Acrobat Reader, Games and any other apps until you free up enough space.Attachments in the Messages app can also take up lots of space. ![]() This section usually blocks a huge chunk of your Mac’s storage space.The ‘Other’ tag contains system to files that don’t fit in the general file types. Right-click on it and select Move to Trash.If you reached this step and you still get the macOS Big Sur not enough storage error, you have to tackle the Other Storage category. Click on Accounts and disable each account.Important: Use Finder and search for Library. You need to check the one that has a roman temple icon in the folder icon. Your device might search by default for Recents.It’s likely that you’ll find multiple ‘Library’ folders. Most of them can be deleted, however you have to be very careful.To check out files included in Other Storage you have to reach the Library folder again.Tip: If Library isn’t displayed when you search in Finder, select This Mac and filter. Open Finder and click on Applications. Download the macOS Big Sur installation file. Update From External DriveIf you applied all steps provided above and still couldn’t free up enough space for macOS Big Sur, you can attempt to upgrade using an external storage device, and save an additional 12.2 GB of space by copying the installation file to an external ssd and deleting it from the computer: See if you can find files that you can safely delete without affecting the good use of your Mac!Do you have enough space now to install macOS Big Sur? Let us know if you managed to update or if you need additional help, using the comments section available below.Updated (November 14) 8. Some of them might be Application Support, Caches, Cookies, Mail, Messages and others. If you get something like 62 GB you know that you’ve found it!Fix: Use again the ‘Get Info’ option to check out folders from Library and pinpoint those that have a large size. Mail client mac check for new emailsMacOS Big Sur will be installed from the external disk!Credits: Special thanks to our reader Gremeaux L. Double-click on the Alias that links to the Installation File. Copy the ‘Alias’ to your Mac computer. On the external drive, right-click the recently copied installation file and chose ‘Make Alias’. Copy the ‘Install macOS Big Sur’ file to an external drive.
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