2. I get an error message saying that my serial number isn’t valid for MAXQDA 10.

This message can be caused by several things. Either you accidentally entered one or more of the characters incorrectly, or you chose the wrong product ID. Please double-check both of these possibilities (your serial number and product ID are in the same e-mail). If you still can’t solve the problem, uninstall MAXQDA, delete the program folder “MAXQDA 10” from your computer, and try the installation and activation again.