That is a good model, but I'm a little confused about the transition. My license from 2015 obviously doesn't include ST4, but does it still include all version

That is a good model, but I'm a little confused about the transition. My license from 2015 obviously doesn't include ST4, but does it still include all versions of ST3 since it was purchased before this change? Or was it retroactively updated to only capture ST3 versions released during that 3-year window?