Hello Paul:
The version identification can sometimes be confusing. 8.0E is a different release from 8.0G. The former is dated in Mar 06 and the latter is dated Mar 07.
In other words, going from 8.0E to 8.0G (or newer) is not done by Service Pack. It is done by purchasing an upgrade or by subscribing to the yearly upgrades plan.
Are you looking for a feature that isn't available in version 8.0E?