I was about to upgrade to 2.1 from 2.0, but the installer says I have to uninstall 2.0 first. Will my settings for 2.0 be saved after uninstalled, or do I have to copy a file from the 2.0 installation? If yes, which file(s). Just want this to be seamless. Thanks.

Just uninstall and install the new version, all settings including license will be preserved!