Zend certified PHP/Magento developer

System was using bandwidth after windows 10 1909 upgrade

I have upgraded to windows 10 1909 through windows upgrade assistant and it download an ESD file size 3.37GB. The upgrade was complete and I removed the ESD file somewhere else from where it was originally downloaded. But suddenly when I connected to the wifi it started using data took upto 1.1GB. I have updated the windows right after upgrading from windows update.

But my question is why was system using data?

Is it because I removed the ESD file and it was downloading the missing files?

Or the system has to use data after the upgrade?

Thank you