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Upgrade from Big Sur to Ventura

Why can't I upgrade from macOS Big Sur to Ventura. The only option is upgrading to Monterrey. My iMac is a 2017 and I have enough space to install Ventura. Any suggestions?


iMac 21.5″, macOS 11.7

Posted on Feb 20, 2023 2:54 PM

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Question marked as Top-ranking reply

Posted on Feb 21, 2023 3:39 AM

Firstly suggest make sure the exiting Big Sur is running the lasts Version 11.7.4


Attempting to upGrade to a newer version of macOS is best attempted from a fully up to date existing version of macOS


Links below specific to this issue


Keep your Mac up to date - Apple Support (CA)

What's new in the updates for macOS Big Sur - Apple Support (CA)


In Theory the computer can jump the quay and move directly from MacOS 11 to macOS 13 but may suggest moving to Monterey before attempting the move to Ventura


User's Choice though


4 replies
Question marked as Top-ranking reply

Feb 21, 2023 3:39 AM in response to alv47

Firstly suggest make sure the exiting Big Sur is running the lasts Version 11.7.4


Attempting to upGrade to a newer version of macOS is best attempted from a fully up to date existing version of macOS


Links below specific to this issue


Keep your Mac up to date - Apple Support (CA)

What's new in the updates for macOS Big Sur - Apple Support (CA)


In Theory the computer can jump the quay and move directly from MacOS 11 to macOS 13 but may suggest moving to Monterey before attempting the move to Ventura


User's Choice though


Feb 21, 2023 3:46 AM in response to alv47

Follow on


There are factors:


1 - Like poor Wifi connection


2 - Slow wifi connection


3 - Too many other people downloading at the same time and Apple Severs are overloaded


4 - Software on the computer interfering with the download process including AntiVirus Software


Notation: Disabling the AV Software may or may not solve the issue. Removal of the AV Software may increase the chances of the download to perform as expected.


5 - Running behind a VPN which may increase Packet losses or corruption of the download 


6 - If via wifi too many Other devices using the wifi at the same time reducing the Bandwidth to your computer. 


7 - Best Results are via Ethernet Cable to Router


8 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal and Try Again using the Software Update Applet in System Preferences

Upgrade from Big Sur to Ventura

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