When the trial version worked, I suspect first that the installation is damaged due to a broken download. Download and install it again from our download page. You can just install it in the same folder as the previous version. If there is a wed.cfg file in your Gamestudio folder, delete it.

If that does not help, please contact Gamestudio Support and send them the crash information. It's in the files wed.log and wed.txt in your Gamestudio folder when WED crashes.