Hi Robert,
We developed the "SMW" weather file format relatively early on in the history of SAM for a specific application, and then later developed a more flexible format we call "SAM CSV." SAM continues to be able to read files in the SMW format (along with other legacy formats like TMY2 and TMY3), but when we make changes to weather file related features such as macros, we don't necessarily test them for the SMW format. Your SMW weather files should continue to work for simulations. For a description of the SAM CSV format, you can refer to SAM's Help system ("Weather File Formats"), or you can download a PDF version from
sam.nrel.gov/weather-data/weather-data-publications.html.
Yes, we fixed those erroneous error messages about the PV bifacial module option with one-axis tracking in SAM 2020.11.29 r1.
I hope you are able to get your Windows 10 up and running soon!
Best regards,
Paul.