You did allowed avast to automatically check for updates and install them or this wouldn't have happened. or you did initiated a manual update yourself.
The new gui isn't messy at all.
Hard to read? That depends on your eye sight.
Sure, you will have to spend a little time to get used to the new gui but that is all.
If you like the looks of it or not is just a personal opinion.
One can't please all.
You can't prevent Chrome from installing unless you have chosen for a custom install.
How much did you drink at the dinner?