The latest versions of Opera supported by each of the retired versions of OS X.
The archived versions of Opera can be found here, https://ftp.opera.com/pub/opera/desktop/… however, which one is right for you? Read on…
To disable automatic updates see Opera and Mountain Lion.
Last Opera versions compatible with OS X versions
Mountain Lion => https://ftp.opera.com/pub/opera/desktop/36.0.2130.65/mac/
Lion => 28
(Opera 37 requires 10.9 – contrary to the title here: Continued Support For OSX 10.8 Mountain Lion
Only for the brave or foolhardy…
A registry tweak is provided to allow versions >37 to be installed in Continued Support For OSX 10.8 Mountain Lion:
Welcome to Opera’s forums @Scrutinizer1!
If I’m not wrong, Opera 26 is the latest one for your MacOS version, also for WindowsXP and Vista.
At the other hand… :ninja:
I read somewhere that is possible to disguise system versions to skip limitations, (actual Opera
version is 45) I Google it and found a website where they are explaining how to do that trick. (If you are interested)
You must read the comments before.
Edit OSX Version | Install soft | Restore OSX Version
Change Mac OSX System Version
Similarly a hack for Firefox, Best Browser for OS X Mountain Lion in 2016?