What do I do with my RINEX files?

Put them in the [data] folder.

Download the reach-Base_raw file and open the compressed folder. Inside there will be 2 or 3 files (.obs and .nav) or (.210, .21B, .21P) or (.220, .22B, .22P) copy and paste them into your project's [data] folder. Now your project is packaged and ready for pre-processing.

Do you want to use your RINEX files for an OPUS solution? (hint: I hope you logged for 2+ hours)