Then why Softimage 2010 is working
? I installed it right now with no problems. They use different licensing systems?
Same licensing systems, but different licenses.
Trial is a special version of a standalone license, and it is virtually impossible to reset.
That 2010 is running with a permanent license (I don't see "Trial" in the title bar). I can't tell if it is standalone or network. I'm going to guess network. Usually a hard drive reformat would require you to reactivate the license, but maybe you got lucky there.