Lots of zoom problems

Hi I need zoom for school but I'm having a lot of problems with it and I'm not good at technological stuff. 

My first problem is when I sign in on the app on my windows 11 running laptop it says I need to update but the profile icon is not there. My second problem is that when I phone the number for help, I put in my id and host numbers that are on my profile but the automated voice says that they are not recognized and won't help me.  

My third problem is I can get video but no sound, I can't hear anyone and nobody can hear me. 

Please help me I don't want to fail because my only grades come from tests and discussions in one course.