Hi,
That is bug that will be fixed in a future version of R2D. In your version, only Python 3.8 is supported, even though it says 3.9 should work. Therefore, you will have to use Python 3.8.
Note, that we are making substantial changes to the new version of R2D (coming out in the next week or two). The examples have been updated and may not work if downloaded through the examples manager built into R2D. I have attached an older versions of the examples file (Examples.json) that should replace the one in the R2D/Contents/MacOS/Examples folder. This will ensure that R2D downloads the examples that work with your version of R2D, i.e., an older version of the examples. Let me know if you still run into issues.
Best,
Steve