Old UI seems to last only for first install

So, somehow I was able to use the old UI through older versions of Opera GX, but that only seems to last through first-time usage, because when I close and reopen the browser, Opera forces the newer version with the crappy new UI through all future usages. I tried renaming the autoupdate.exe, and I tried using Task Scheduler. But none seem to work. How can I keep the Old UI persistent after installation of the older version?

reddit.com
u/Realistic-Key-4195 — 17 days ago

Old versions still use New UI?

Hey, so I'm having a problem. I'm trying to install an older version of Opera GX with the old UI pre-2025, but apparently, Opera doesn't support it and shows me the new one whenever I try to install it. I tried uninstalling it and reinstalling it, and it doesn't even work. I need help! How can I install an older version of Opera GX and keep the old UI?

reddit.com
u/Realistic-Key-4195 — 18 days ago

I want to use the current player with the Vorapis extension, but I can't find the option for it. Is there any way to turn the Vorapis player off while keeping the UI the same, or is it stuck on it until I turn off the extension?

reddit.com
u/Realistic-Key-4195 — 2 months ago