After some difficulties, working around security features, I have managed to download and install the source code. Now I am having difficulty getting it to read my data. I get the error "Cannot open data file ""

If it is being used by another application, close it first, then press RETURN

Otherwise enter a new name for the data file

Press ctrl+c if you wish to stop the program now:

Has anyone else had this problem? Did you manage to solve it?

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