I'm getting the build error below after downloading trial, un-zipping and opening the demo project
Error 1 Element 'DayPilotVertical' is not a known element. This can occur if there is a compilation error in the Web site. C:\Documents and Settings\Administrator\Desktop\DayPilotProTrial-4.0.1186\Demo\Test\MouseOffset.aspx 4 19 C:\...\Demo\
In Test directory, there are samples of various unusual use cases. I forgot some files that use DayPilotVertical control (that control was replaced by DayPilotScheduler in DayPilot Pro 4.0).
I will fix it in the next SP release. You can delete the Test directory safely in order to get the web project compiled.
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