Had Avast Premier for years.
It stopped updating virus definitions or the program itself about a year or so ago.
When I uninstalled it, it made me lose my ethernet connection.
On Windows 8.1.
So I kept it & updated it manually.
Now I have the latest version of Windows 10 Pro.
https://s8.postimg.cc/8k0h0oq2d/screenshot_52.jpg
With 8.1 & 10 Pro(earlier versions) I lost my ethernet connection after uninstalling Avast Premeir.
In desperation I downloaded the free version of Avast & installed it OVER the installed version of Avast Premier.
It replaced the Premier version totally.
Today I used Revo Uninstaller to remove the Avast Free version.
Only after using Macrium Reflect to make a complete system image of my OS.
After Avast was removed I still had my internet connection.
Windows Defender started automatically.
Never again will I use any Avast product.