i coulden't open the file because am using proteus 7.6 but any way i trayed as you said 15mil
and it works but theres same pins are not connected like between resistor of the push button and VCC
What do you mean, what doesn't work?
I made the traces manually, do the trace of 40mil as normal and then select the 15mil and draw a 15mil trace over the 40mil one in the region where you want it to be narrow