is there no more support after I have paid for the Mach 3 product..?
Any support that is provided by this forum is given on a voluntary basis and is totally unrelated to anyone's purchase of the Mach3 license. Of course, we are all here to help each other but sometimes it takes time to receive a response so please be patient.
Assuming I correctly understand what you are asking...
Mach3 does not in itself output a 5 Volt signal. What it does output is a TTL signal the voltage of which, if you are using the parallel port, could be to the 3.3 Volt TTL standard or the 5 Volt TTL standard (dependent on your parallel port).
There is always more than one way to do anything but this method is probably what you are looking for...
In Mach3 Config. / Ports and Pins / Output Signals you can enable
Enable 1, set the Port and Pin # and Active state to provide this TTL signal which will be directly tied to the EStop state.
Tweakie.