Error message when installing plugin

I can't install any of the plugins. I have tried several and I get an error button every time that doesn't do anything. I saw the other questions on the forum that were similar but those solutions haven't worked for me. I also waited until the right time for instant chat help and even though it was 3:15, I could not click on the chat time. Looking forward to hearing back about everything. thanks. (Until then, my boss is pissed because I literally can't get anything done. My sole project is this website.)