Can't re-install Zoom; have to force quit the installer

I un-installed it because the update wouldn't work; had to force quit that.  In the last 6 months when using Zoom my MacBook Air has frozen up.  Can still watch the Zoom but can't use any controls for Zoom or on my computer; have had to use the power button to shut it down.  Today I had the idea of re-installing Zoom but now I can't get it back on the computer.  I tried to use a ticket for Zoom but even though I have an account number, etc., it says that I am not associated with an active account?  HELP