Licenses purchased/renewed after 09-10-2014 are NOT compatible with Archive Server for MDaemon versions lower than 4.2.0.
Trying to insert a "new" license into an ASM lower than 4.2.0, you will get the error:
Error – license you entered is incorrect. Please, enter a valid license.
Plaese, verify that you have typed correctly owner and code of the license (it is recommended to make a copy and paste of data received by email) if the error persists even updating ASM to 4.2.0 or later, .
Finally, if none of previous points has solved the problem, please, contact Achab support.