The checkbox does exactly what it says on the tin:
"Download updates while installing"
Whilst your installation is performed, updates are downloaded in the background.
Those updates are not installed, but instead available to install once you boot into final system.
The checkbox does exactly what it says on the tin:
"Download updates while installing"
Whilst your installation is performed, updates are downloaded in the background.
Those updates are not installed, but instead available to install once you boot into final system.