Daniel, thank you!
When I pressed “Help” button from main menu of uSimmics or previous version, the additional icon of “Help” window is opened in bottom Windows taskbar, but when I click it – no any windows opened. Very strange behaviour. Also Help can’t be opened from the folder separately.
At same time old version QUCS 0.0.19 help works normally.
Thank you!
Will wait for support.
Sergej.