5.25 double density

[floppydumper]

I'd check for physical damage or dirt on the outer track of the second side. Perhaps clean the disk and try again. If there is no physical damage, something could have erased it. This does look like damage, and not copy protection. Specifically, the damaged area should contain part of your "install.exe".

How did you establish which files are affected? Is there some way to do this using the PCE tools? I've just been using Samdisk's scan option to check the CRCs of each track on my MFM dumps, but that doesn't tell me which files are impacted if a CRC fails.