The release notes won't be very enlightening. Assuming you're running Windows, install the latest (64-bit) to check out during the trial period.
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.
Look here for the latest 64-bit release that falls within your licensing period, or install the 11.22 (64) version. Ignore any virus warnings.
Your license should be good.