I used the 0.12.35 demo from https://www.factorio.com/demo

I've still not managed to get it to work as per my last post, I did get the old demo to work though so been playing that and am going to buy the game now!

Hi Daniel,

The missing files stopped the initial error thank you, however it seems that they still fail some form of validation (image size?), please see the attached screenshot.

Hi,

I am trying to play the demo but it won't launch. I have tried from steam and from the download on your website and get the same error on both. I am running Windows 10 fully updated, I also found this post by someone having the same issue:
https://www.reddit.com/r/factorio/comments/4zt9aq ...