download this version: http://www.filehippo.com/download_opera/61354/
I have it back to work using this one and will wait for a new 30.x version

Same problem here on several 2012 R2 VM's.
I've try the offline package Opera_29.0.1795.60_Setup that I get from Filehippo and seems to get it back to work.

I also reinstall a complete development box until I figure it out...