how to save changes to downloaded instrument driver

[curve]

I am using downloaded Tk278x drivers. The default address is different
from my what I want. I tried to change the address in the VIs. But I
am not lucky. How can I do it? Many thanks.

Lorentzian curve fitting

[curve]

Can I do Lorentzian curve fitting with labview 4? The formula for
Lorentzian fitting is y=k0+k1/((x-k2)^2+k3).