"MacBook Pro (2018) upgrade download issue to Sonoma/Ventura: Currently my Mackbook pro OS version is High Sierra and I'm upgrading or installing to Sonoma or Ventura but I'm facing issue while downloading and my Mac build year 2018"
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A Few Important Notes on Updating:
A. Delete ALL VPNs:
Are you using any VPNs here? If, so, delete them, as it can get in the way of data transfer and synchronization speeds.
B. Use Ethernet:
How are you performing this upgrade? If an avail option to you, then use Ethernet, for a more reliable connection. This is the Adapter that Apple Sells: Belkin USB-C to 2.5Gb Ethernet Adapter - Apple
C. View Apple's System Status:
Note that Apple may have issues with the system. As of this reply, nothing is shown. Go here: https://www.apple.com/support/systemstatus/
D. Use a Private LAN:
If you are using public LAN (i.e. a campground or a hotel), then you might bet kicked off the LAN in an instant, and you'll need to request a new code. So, perform it while at home.