You can move the Location of the default Download folder, by modifying it's target location from File Explorer.
Open File Explorer > This PC > Downloads > Right-click and Properties > Location (tab) > Move (button) > "Select a Destination" and Select Folder (to confirm) > Apply and OK (button)
You may be asked if you want to move all files to the new location.
This will become your default location, for any web browser you use.
In the
Advanced Settings, you can toggle ON/OFF to use Adobe Flash Player. Similar to Windows 8/8.1, Adobe Flash Player comes with the OS, so with it's security updates are pushed via Windows Update.