Preamble
Following on from The fat lady sings…
I have Opera 36.0.2130.65, and it keeps on updating to 42.0.2393.137, so if I close it, it will then refuse to run, as 42.0.2393.137 is incompatible with Mountain Lion. So I then have to reinstall a fresh version.
How can you stop it from updating..?
Related Links
Solution
For Mountain Lion the last supported version is Opera 37.0.2178.5.
In a terminal, navigate to the contents of the Opera application package:
cd /Applications/Opera.app/Contents/MacOS
If you then run ls you should see the binary responsible for the automatic updating, opera_autoupdate.
The solution is to stop the opera_autoupdate binary, by renaming, or deleting, it:
mv /Applications/Opera.app/Contents/MacOS/opera_autoupdate /Applications/Opera.app/Contents/MacOS/opera_autoupdate.bak
or
rm /Applications/Opera.app/Contents/MacOS/opera_autoupdate
Of course you could just right-click on the Opera application, select Show Package Contents and navigate to Contents:MacOS and there you can rename or delete opera_autoupdate. Note that you might have to do this after having opened it for the first time and OS X has verified the downloaded (newly copied over) binary, otherwise you’ll end up with a dialog stating that Opera is corrupted and that it should be moved to the trash.
Alternatively, from this post on Is there an available version of Opera for OS X 10.9.5 (Mavericks)?
defaults write com.operasoftware.Opera OPDisableAutoUpdate true
This is the end, my friend
gr33nonline 