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I have everything downloaded to be able to use Quartus, but when I try to create a file I get this message: "Can't open project -- you don't have permission to write to all the files or create new files in the project database directory". In the questions I found a similar comment that mentioned something about bits and gives the solution with a command (attribut -R/ S/ D/ *) I also tried it and it's still the same. I hope you can help me solve this since I need it for school.
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As mentioned by sstrell, check that you have permission to edit the file in the project directory.
When you create a new project, Quartus by default will use the Quartus installation directory, which you might not have permission to edit/write.
Change the working directory for your project and see if the issue still persists.
Regards,
Richard Tan