Why aren't plugins downloading?

OK, for the past couple of days I haven’t been able to download mingle forum or wp-forum server plugins, both get stuck at unpacking, tried installing mingle forum manually like 2 or 3 times and the theme kept getting messed up. I’ve tried several different things to solve the issue. Nothing works, other plugins won’t work occasionally and I’ll try them a few minutes later and they install fine. But the forum plugins won’t, for the past couple of days I’ve been trying to install them and nothing, I’m really getting frustrated.