Hi! I erased my mac and reinstalled the new OS X Yosemite. I'm reinstalling every program and app. Autocad 2014 (teacher license, only used once in this very same computer before erasing it) and its SP1, SP2 and SP3 have been reinstalled as well. To initiate Autocad I'm asked to introduce my serial number again but... it says "The serial number you entered is not valid. Try again. (1)"!!! Why???
