Cannot install macOS Big Sur Beta

App & System Services Core OS macOS Beta

RobChag OP

Created Aug ’20

Replies 61

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Hello all,
I'm trying to install Big Sur beta and I face the same problem every time - after the installer is downloaded, installation starts and when the progress bar reaches 12 minutes installation interrupts with an error message "An error occurred installing macOS. You can try again to complete the installation".
I encounter the same problem starting from Beta 3, then Beta 4 and now the Public beta.
I performed SMC reset and even complete reinstall of macOS Catalina with no avail.
Would appreciate any help or ideas.
My system is 15" MacBook Pro (15,1) running macOS Catalina 10.15.6.

Boost

avinashk_51 OP

Jan ’21

Even I am facing an issue installing Big Sur, unlike others the issue with my 15MBP is the entire 12.2G file gets downloaded and then nothing happens; the installation doesn't start. If I retry it starts from square 1 trying to download 12.2G again.