Follow the link and opera beta 10 & 11 are there for download.
I've had Opera installed twice (2 different directories) on my desktop for some time now. Configure one for "loose" settings for banking, etc. and for regular browsing I have one set w/ java, js, pop-ups, etc. turned off. That way, once you have each configured there's little need to change.
The beta's install over the top of existing installs nicely.
I also experienced closing crashes w/b7. Nothing to that effect so far with 10 & 11 beta releases.