Related: Windows 10 Anniversary Update: What’s new?
Just hit the three-lines menu in Edge and select ‘Import favourites’, then choose the appropriate browsers from which you want to obtain your bookmarks and hit ‘Import.’ It’s that simple.
Windows 10 has set those associations back to their default status.
Unfortunately, you’ll need to go through and change them all again manually. Simply right-click a file that isn’t opening as you want it to, highlight ‘Open with‘ and click ‘Choose another app.’ Now select the app you want to use to open the file type and tick the ‘Always use this app.’ Now hit OK.
The first way to do this is to download the Media Creation Tool, right click the Media Creation file, then click Run as administrator. The other method is to upgrade using the Windows 10 ISO file, which is a much more involved task.
Your best bet is to head straight to the relevant Microsoft Community page and follow the guidelines listed there.