Also for the addon applies the same thing applies to the main game: Without forced activation via the Kalypso server and compulsory coupling for an account you do not get patches. In addition, the patches not as a file on your hard drive can be stored and thus have to be downloaded again with each new installation. This naturally also applies for a possible second buyer, IF Kalypso agrees because the license transfer!
What the system for benefits has: For the customer: No For the publisher: He must on the package does not refer to the activation and the account forced because of course you can always play the 1.0 version ...
