I'm logged in my.st.com
In my.st.com/analogsimulator/ I chose: Negative Buck-Boost and I click "Create" Button.
I set correctly the input voltage, output voltage and output current.
I chose the desired IC.
I click on Start Design button, a new blank page opens.
Initializing bar appears but the page closes after a while.
The browser (Chrome) and Flash Player are updated.