As far as I can see the name's spelt "MCrich" as in M(ichael) Crich. See:
http://www.fiatforum.com/cinquecento...mckcritch.html
E-mail developer: michael@crich.org.uk And please be patient, as it's just the one guy, who probably has a life beyond cars.
Search here, or (fl)eBay or Google the name for possible sellers.
Be warned! From what little I've read, the "General" chip disables the immobiliser function of the ECU, so your insurance may be invalidated as a result. Don't say I didn't tell you.