If you are a drafter who values over cloud features and trendy interface designs, AutoCAD LT 2016 SP1 64-bit is a "Top Tier" choice. It is the sweet spot of modern computing power and traditional CAD workflow.
An official update for AutoCAD LT 2016 64-bit would typically be named something like: AutoCAD_LT_2016_SP1_64bit.exe autocadlt2016sp164bitexe top