Hi Marcio,
thanks for the data.
1. I have tried to download the small .zes files with the Chrome and Brave browsers and all does it open directly as described. The try to download any bigger file was not succesful. No idea why not.
2. Afterwards I was go to your backend and checked your settings.
- I have activated again the option: "Send files using PHP script".
- Then tried again to download the small .zes files and also the bigger files (also a file around 600MB).
-
The result was perfect and I could not see any problems. I have it tested with
Chrome, Firefox, Edge and Opera. The last both was unused before and has only the default settings.
All Download processes was succesful as expected. Also with progress bar and very, very fast. And with enabled "Send files using PHP script" option.

So maybe is your reported issue only a local problem on your PC.