A registration window will always show up when you run trial version of Flash EXE Builder.
You can also open this window by clicking on Help => Register Flash EXE Builder menu.
1. Get a serial number
Click 1. Click here to get a serial number... to obtain a serial number. Please make sure you are connected to the internet. An internet browser will open Flash EXE Builder purchase website.
If you already have a serial number you can skip this step.
2. Enter your serial number
Please enter your purchased serial number and click Unlock.
You might receive your serial number in your email after purchase.