With Webbla 1.6.2 we have switched from the license file to a license code but you can still use your classical license file by following the instruction below.
If your license is already registered there is nothing to do but if you deregister your license or switch to a new Mac Webbla will automatically show you the new license dialog.
To make the old license panel visible you have to press and hold the command key when you select “License…” from the Webbla menu. After you have registered your license file everything will work back as it was before.