Hi,
I checked. Firefox throws a security issue with the name of the download ( potential risk, not downloaded ).
Chrome has issues with the mixed content :
Mixed Content: The site at ‘https://copos.com/’ was loaded over a secure connection, but the file at ‘http://update.copos.com/COA.LZH’ was loaded over an insecure connection. This file should be served over HTTPS. This download has been blocked. See https://blog.chromium.org/2020/02/protecting-users-from-insecure.html for more details.
You nailed it; Chrome will never ever work with my download buttons. Unfortunately (for me), the software that’s putting the files there is too old to handle https, and can’t be updated.
Thank you very much for your help. You saved me a bunch of time and my head will stop bashing on that particular wall.
Welcome! I will put the topic to resolved then.