I am also having this problem, on the Beginner's Tutorial. I have just downloaded Construct 2 and would like to get started learning how to use it but the images in the tutorials are all broken...
Stack Trace:
[FileNotFoundException: D:\Uploads\filenew.png]
System.Drawing.Image.FromFile(String filename, Boolean useEmbeddedColorManagement) +475155
System.Drawing.Image.FromFile(String filename) +6
DisplayImage.ProcessRequest(HttpContext context) +1682
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69