Apparently, you are trying to save files where you shouldn't. By default, TransDEM stores all its files, including the sources for the tutorials, in the protected "Program Files" directory tree. You need so-called "elevated" rights or admin rights to write there. Standard Windows users can raise their access rights to "elevated", but fortunately these aren't enabled automatically. This prevents you from accidentally messing up the installation.
Instead, set up up some directory sub-tree in your user area, typically under "Documents", for all your TransDEM projects.
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