All quarterly upgrades must be installed in sequence. The version you are running is shown in the bottom left-hand corner of the home page, and the version increment cannot be more than 0.01 in a single pass.
There are likely to be several significant changes to the BNF content over the course of a quarter, and to emphasize this users will be presented with a warning that the content has expired if an upgrade is not deployed within a month of its release (i.e. the BNF data are more than four months old).
If you missed the previous quarterly release, it is easy for a system administrator or technician to obtain and deploy it before bringing your installation up to date with the latest release.