Downloaded the free version of MultiECUscan and bought a lead and a set of adaptor cables, tested it out on my MKII Punto and it connects fine.

But I noticed that when I scrolled the list to Grande Punto the available ECUs are highlighted in RED !

Does this mean its not going to scan a GP ? Do I need the 'paid' version ?

It's been a while since I played with MES as I no longer have a GP, so i can't remember exactly.
However, I do recall that the free version is limited to what it can do, but i think reading engine codes is not one of the limitations.
I also recall that ours would generate an error when connecting to the ECU complaining along the lines of it not being compatible, but it always connected.

I'm having similar problems where by it can detect the car modules fine and seems to connect to the ECU but it then tells me i need the subscribed version.

Several people have told me this should be free, and i am looking for a list of the supported ECUs on the free version but having no joy finding it.

All i want is to see and clear codes

List of supported vehicles and ECUs is here: http://www.multiecuscan.net/SupportedVehiclesList.aspx

All ECUs printed in black type are accessible with the free version. Those in red type need the registered version.
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Keep in mind ELM WIFI modules works only on registered version.

Multiscan will only let you play with the full version for the GP.

Its worth the money though.