If you have deleted Macintosh HD before installing Big Sur, you may get the error reading "you may not install to this volume because it is invalid or damaged." When that happens, you need to reformat the startup disk in Recovery mode using Disk Utility.Follow these steps to boot into Safe Mode: shut down Mac > wait for 10s and then press the power button > hold down the Shift key once Mac starts up > Release the key when the Apple logo appears. If macOS Big Sur cannot be installed on Macintosh HD, you can try installing it in Safe Mode.If there's no prompt for the installation to continue after the macOS Big Sur download completes, search in your Application folder for a file named "Install macOS 11", then double-click it to start the installation process.Suppose you can't install the downloaded macOS Big Sur update even with a compatible Mac model, delete inessential files to make more free space for it (Check how much disk space you have in Storage Management), then follow the solutions below. Here is the list of Mac models supporting macOS Big Sur: To ensure a successful macOS installation, you need to check whether your Mac is supported before downloading macOS Big Sur. You may also see a similar message reading "macOS Big Sur Cannot Be Installed On This Computer" when you attempt to install Big Sur on an unsupported Mac. You are installing Big Sur to the same APFS container as previous versions of macOS Catalina 10.15.A conflict in the system is preventing the macOS installation.There's not enough disk space on Macintosh HD. You can read below for the solutions to the "macOS Big Sur download has failed" error. However, if the macOS download takes more time than expected (like hours), there's likely insufficient storage space or an unstable internet connection. With a large size of over 12 GB, it might take a while to download macOS Big Sur.
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