Sudden problems and I can't continue teaching.

Hi Everyone in Zoom Community -

I'm a tutor and I rely on my free Zoom account as I only have one student at a time.  When I attempt to start a meeting, there has always been an 'allow' button to push and my meeting begins. The 'allow ' button has disappeared.  When I attempt to press the blue 'launch' button NOTHING launches. My only remaining option is to join using my 'browser" but that does not give me the option to share my screen which I need to do. 

Can anyone tell me what is going on? Is Zoom forcing this so that I must have a paid subscription? I'd like to know if I pay if I will have better service. 

Thank you so much!