Rhino Free Trial Over

My Rhino 4 free trial is over and i have a whole project done that i cannot save. I started another trial but i still can’t save my original project.

That is correct. When a Rhino for Windows evaluation has expired, there is no way to save or export. Even if your purchased a license, an expired evaluation can not be revived without restarting.
An expired Mac Rhino can be revived without restarting and we are working on similar tools for Rhino V6 for Windows, but V5 and early can not be.