Not able to install osu!

i have installed Wine, winetricks and mono to run osu! (windows game), but everytime i enter the setup, it gives me a error saying that i am not connected to the internet (to download .net framework 2.0), even though i am.

i just ignore that comment because mono is installed and continue with the setup. it copies all the files and finishes the setup, but when i click on the application, i see the application trying to load, like for 5 secs, and then nothing happens at all.

the requirements of this game are very less;
System Requirements:

1GHz+ Processor
512mb+ RAM
Microsoft .NET Framework (2.0+, 32bit)

thanks in advance