Did you download AutoCAD for Mac? If so there is a known issue surrounding the product activation with our new 900- serial numbers, of which is detailed here. Specifically:
If you are using AutoCAD for Mac, you can activate the software by:
1) choosing to install the software in trial mode
2) when launching the program in trial mode (once installed) you will be faced with run / continue in “trial mode” or “activate” - select the activation option
3) follow the process (enter Serial Number and Product Key) to circumvent the previous issue and allow for a proper activation
Everything appears to be correct on our end. Please try the workaround previously listed for AutoCAD for Mac to see if it might resolve the issue.
Once you have downloaded the trial version, you can choose to activate it using your serial number and product key (777E1). In case you encounter any activation issue, you may contact our Registration and Activation Team here.
Let me know if you have any further questions.
Yes but where can i dowload this trial mode?
Once i'm on the home page http://students.autodesk.com/?nd=m_home i click on AutoCAD -> AutoCAD for mac , then i get my serial number and i can download it already ... i don't understand in what page i have to dowload the trial mode , ican't seem to find it :s
Actually, you don't need to download the trial version. What you need to do is download the student version of AutoCAD for Mac from the Education Community page you mentioned, and then launch the program in trial mode. You will then be faced with run / continue in “trial mode” or “activate” - select the activation option. Enter the Serial Number and Product Key to circumvent the previous issue and allow for a proper activation.
The above steps are also described in this AutodeskCare page. We hope this clarifies the issue. If not, let us know.