In a fresh installation, when starting the first model, the File> Import menu item is grayed out and not available. However, if you load some model from an older version (which at least from 1.1.1 in 1.2 seems to work) and close it again, then the import item is enabled.
Import becomes available after you create a new model and select model space as well as a unit system for it (you can leave the defaults).
That is a new behaviour of PrePoMax. Now it starts with an empty workspace. The reason is that now 2D and 3D workspaces are possible and the user must first select the workspace before importing a geometry.