http://opera-usb.com/download/operausb1164en.zip

From the Opera 11.64 changelog:

Stability improvements
Resolved a handshake failure on https://autoupdate.opera.com
Fixed an error where an on-demand-plugin placeholder could lower the security status of a secure site to insecure
Fixed an issue with some secure pages not loading - PayPal, Ebay
dojotoolkit.org: Errors when using the dojo amd loader have been resolved
rts.rs: A JavaScript error has been resolved
Fixed an issue where certain URL constructs could allow arbitrary code execution, as reported by Andrey Stroganov

It's already updated!

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Added 177 Applications: Portable and an AutoIt MVP
SoftwareSpot - Portable Apps

Opera@USB 11.64 was released today.

I think the confusion originated from the fact that Opera@USB is no longer the primary listing on PFC. Opera is because it includes a portable installer inside its standard installer. This was updated weeks ago, along with Opera Portable from PortableApps.com (which fixes things like portablizing settings paths, speeddial backgrounds, etc) which is also a secondary listing. Opera@USB doesn't appear to be maintained as well anymore, nor is it strictly necessary any longer as it is simply a zipped version of the standard Opera installed in portable mode.

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PortableApps.com - The open standard for portable software

I know, but Opera is the main product now not Opera@USB. Opera@USB is Opera extracted and then recompressed as a ZIP file, despite the fact there is no difference between using the 'official' Opera installer.

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Added 177 Applications: Portable and an AutoIt MVP
SoftwareSpot - Portable Apps