The following data downloads repeatedly fail with "The website encountered an unexpected error. Please try again later"
QX Cas 2459490 2459510
Z CrB 2459300 2459400
I just downloaded data for both of those stars using the data ranges you specified without a problem.
Please try again to be sure it wasn't just a server glitch. If the data download tool still doesn't work for you, please contact me offline so we can troubleshoot.
Many thanks and best regards,
Thanks to Elizabeth for correcting me on this, I had used an unacceptable format in one column and also included a blank line at the bottom of the file. The file was accepted after I made those corrections.