Brad, TMY3 files downloaded from NREL's site should work fine with the demo version. You do have to make sure that you are using the TMY3 mode of Type15. When you get the error, to what "it" do you refer? Is there an error generated by TRNSYS? Is Windows complaining about the file type? Some additional specifics about the source of the error and the language of the error would help in tracking down its cause. kind regards, David On 04/19/2016 07:05, Brad Painting
wrote:
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