Hello @Anonymous,
Do you have an error message? Is the software asking for an activation code?
You can have a look here to get an activation code: Get an Activation Code
If this is not working you can contact the support over this link: Contact Support - Installing or activating my product

@Anonymous
Welcome to the Autodesk User's Community..
Although the forum rules caught your serial # and "X" it out, never share any sensitive information here such as email address, serial #, subscription account number, business address, and phone/cell #. This is a world wide peer to peer network and such items should not be posted here for security reasons.
In addition the 2015 version is retired. Where did you get this version? Is this something your purchased like 3 or 4 years ago? Also activation is only possible based on the history of the serial #.
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.
hello sir
i do have the same activation problem for my autocad lt 2015
online activation shows error message and when i try to get from manual activation i get error for country code error
what should i do sir ?