how do i get quartus ii 10.X versions?

oh. ok. some Q.

i am new in quartus. so. i heard we can simulate n create vector waveform in quartus ii 9, but need another software for simulation in later version 10 n above if i'm not mistaken. heard of modelsim. but...

- what's the use of niosII?

- tried quartus 12 n modelsim 10.0d, but it seems option for creating waveform is disabled. also the 'opimization configuration' option. is there in any way i can enable it for this version? need to create my own vector waveform.