If you have demos or trial versions then say such.
When I look at your post on Maxwell, it looks like you purchase because you say so.
 

I finally purchased Maxwell render V3…but the thing is that i am not sure what it is exactly that i purchased!...this might sound funny…well…it isnt. I hope that i have not wasted my money…as this was quite an expensive deal!...

Demos and trial versions usually have limitations, especially on saving and exporting.
You havew to let people know what flaVor of application you use to avoid wheel spinning.