"Can't personalise" error when upgrading to Ventura - help?

Q - " I'm running a MacBook Pro M1 (2020). OS X 12.2 (doesn't seem to want to upgrade Monterey either) "

A - Running a very out dated version of Monterey can be a major Contributing Factor

A - The current version of Monterey is Now 12.6.3

A - It is strongly suggested to update Monterey to version 12.6.3 First

A - Then and only then attempt the macOS upGrade to Ventura

Links below on Keeping the computer up to date

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

About the security content of macOS Monterey 12.6.3 - Apple Support (CA)

In conscience >> Make Time Machine Backup  before moving forwards on the above.

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