Share 'Last grasshopper version not working in Rhino4.0 evaluation version'

Hello everyone, We are having problems to run grasshopper in an evaluation version. Everything is updated so... i don't know where may be the problem. Could be because the evaluation version? In my computer everything was working fine with the licensed version, but students will have evaluation one.   The error is about a DLL 'rhcommon_c' Any thoughts?