1.Delete the cookies in your browser internet explorer or Firefox or opera or whatever u use).
2.Press start->run,type cmd.
3.In the command prompt,type ipconfig/flushdns press enter.Then type ipconfig/release,then ipconfig/renew .Now type exit.
4.Now try downloading, for many people this may work if their ISP provides a dynamic ip
1.Just switch off your router or modem) and switch it back on.
2.This may work for some users Mtnl and Bsnl) and maybe some others too.
Actually these methods generally work for those people whose ISP gives them dynamic ip.
If these don't work then one more thing that can be done is to use proxies.
1.Download the software Hide ip platinum
2.Run it, then it will automatically chose a proxy (ip of a different country) for you. So you can easily download without any restrictions. You just have to change the proxy each time you download.