Nope - Laptop is 43.xxx and is for 32 bit. Don't know why that matters. Desktop is previous version, 64 bit - Stable and should have a menu button, its just not displaying.
Some other software is running then - an email checker or similar. Opera itself doesn't do that. It doesn't even know I have a Google account (though as I also own an Android tablet I do have an account) and has never asked me for one. Or a tab is open to some page using Google services perhaps.
Also updated to 42.0.2393.351 on archlinux - opera still crashes when trying to download.
Disabling [Ask where to save each file before downloading] option allows me to download affected files from the websites. Please be so kind as to not remove this option.
With thanks & kindness.
Thank you, dude! It fixed the problem while I tried to open any file in the browser (under Ubuntu)
Faced this problem almost every day, it's awful trouble. Anybody knows how to set preffered applications for MIME file types? I suppose it would fix the problem, but I couldn't find any MIME settings in Opera