Hi,
I did update like this from 2.3.5 and my all-previous sketches somehow disappeared from the sketch directory. I checked the sketch library location, but they are not there.
The bug that previous versions had (Restart: "A setting has changed that requires a restart to take effect. Press the restart button to restart Arduino IDE and enable the setting" when a new sketch is opened, and next time when a sketch is opened menu bar is missing) is still there.
I am on Windows 10 64bit.