1. download the file from
here
2. unzip it
3. run it as administrator ( if you are using win 7 or vista, win xp user can just run it as normal xD )
4. after you see this

5. change to the speed you want at "Clicks per milisecond" ( 10 is good unless you want faster )
6. click on "On" ( you don't have to click "Enable" )
7. Go in to the game ( A.V.A )
8. Go to setting
9. go to key setting
10. find fire key and change to middle mouse button
11. press F4 to active the macro pro ( thats what "On" for, i set it for hotkey xD )
12. Enjoy
Tip
On and Off is for the hotkey ( do this you dont need to press Enable or Disable )
Hotkeys are F4 ( Enable ) and F8 ( Disable )
And for the "clicks pre milisecond" is clicks pre speed 
The lower you set, fast it shot but recoil will increase too