If you have v18.0.2 installed and activated, once you try to install the new version from https://www.trivantis.com/downloads/v1802/
Just leave the license key blank, once it is installed Lectora will continue to run activated so no need to worry about the key.
Just finished reading this thread. I am having the same blank target challenges. I see the link to the install files, but as I work for a financial services company, downloading and exe. file and installing is not always an option. Is there any other fix that you are aware of?
FYI – If, like me you are awaiting the fix install there is a work around. Build the trigger on the base of your page, then drag and drop to your button and change “Show” to “Click”. Seems to be working.