At present the Vault in the Library displays every item, with an information icon on them which when hovered lists the compatibility data. You then need to hover over each one of interest to see if the version you wish to work with is compatible. It would be very convenient if the version set in the left-hand Launch button, sorted Vault items first by engine compatibility, and then within that, alphabetically. Alternatively, if it dimmed incompatible entries, and kept everything strictly alphabetical. Case in point, every Infinity Blade package except for Infinity Blade: Effects is compatible with 4.11. Dimming, or sorting by compatibility, would immediately convey that conflict so you would know at a glance what your constraints were when starting a new project.