Failing activation of TuneUp Utilities 2014 with message "The product key you have entered is incomplete".

Activation of TuneUp Utilities 2014 may fail with the following message:

The product key you have entered is incomplete. Please check the key entered for possible spaces.

This message is usually shown when you copy and paste the product key, and there is a space " " pasted at the end of the product key.

To activate TuneUp Utilities 2014, please make sure there are no spaces at the end of the product key, or type the product key manually to avoid this situation.