Please do not "get rid" of your terrain. Just load and save it in MED, as mentioned in the 6.40 update instructions. Better don't download an update without having read the "Compatibility Notes" in the update instructions.

@Nitro: I suppose that you are only trying to be helpful. But asking other people for their key file is not helpful, but illegal. It can even lead to your banning from this forum. I have edited your post.

@Sanctioner: Thank you for the detailed problem description. However it should be common sense that sending copies of your key file to other people is illegal and can get you in serious trouble. If you think there's a problem with your key file, please send it to the support.

Since 6 weeks, you or someone else from your team is permanently posting about the same problem: not being able to start a certain WMB file. We've gotten many support emails and several threads in the Bug and the Ask Conitec section on this forum, always to the same issue. Possibly there is indeed something wrong with your version. But for finding this problem please follow the suggestions you've been given numerous times. The first obvious step is just running a different WMB file, like the future level from the tutorial, or the techdemo, and sending the acklog to the support. This could give us a hint whether the problem is related to your key file or to something else. You can also send us your house level for looking into, and your key file.

You've emailed the support again yesterday, so they are now taking over. Please follow their suggestions. I'm sure that we'll then sort out this problem very soon.

I'm closing this thread. But if anyone has another problem with the update, a new thread can be opened here or on the Template or Ask Conitec section.