Unfortunately not on mine.....
That is still the same BIOS file(s) missing issue, unfortunately.
It means either one of two likely scenarios:
1. The BIOS files are not stored properly. This can hopefully be remedied by reviewing the steps provided, along with the additional advice given by a few of us, in this thread, under a fresh new/clean folder/install.
The key being the "Atari7800_mergedbios.zip" file is unzipped (only), which provides a "bios" folder that contains a "a7800.zip" file.
That "bios" folder containing the "a7800.zip" file intact, should be stored as a subfolder to where A7800.exe resides. [I.E. C:\A7800\bios\a7800.zip]
2. The typical steps outlined and advice are being followed, but Windows is not copying or denying access to the files. It could be a UAC or Admin folder issue.
*EDIT: NIKON beat me to the punch.