So the main problem I have with the new version is that if I happen to download a file that I already have with the same name in a folder. Opera 28 now decides to add (1) at the end of the file name causing me to have duplicate files which is very god damn annoying.

Don't you get a dialogue how to save? There must be one.
Besides, while in practice those are more often the same/'duplicates', in principle they do not have to be such at all. Apart from occasionally the same file-name url part for a couple of files from different pages/servers, the files' contents themselves are not written in stone and subject to a possible or scheduled change on the server side (of course). It might relate to graphs, images on weather forecast/observation services, for example. Or when it's user uploaded content, it might be subject to updates by the users.

I say what? You can just backspace those parenthenumbers in your download dialogue. For the dialogue to appear, you might need to check certain settings in the browser.

Only browsers I know that do are Opera and Chrome.

Add IE to that list.

And fortunately Firefox still doesn't do that ridiculous practice.
Only browsers I know that do are Opera and Chrome.

So the main problem I have with the new version is that if I happen to download a file that I already have with the same name in a folder. Opera 28 now decides to add (1) at the end of the file name causing me to have duplicate files which is very god damn annoying.

Opera 27 already did that, you won't solve your issue by rolling back a version.

Opera 28 now decides to add (1) at the end of the file name

Thats standard practice for pretty much all web browsers.

To go back to the old version just delete the new version folder in the installation directory.

You may need to also edit the file install_prefs.json (or something like that) and change the folder info.

Or you can just delete the installation folder and install the old build.