It works with both Lr 5 and 6. As of now I like its results better than Lr6 HDR but iI expect Lr HDR will improve. Lr needs to add focus stacking like Lr.enfuse.
DId you try this
The Latest version is 4.32 and looks like you are trying to use 4.12. You need to download the latest version as I dont know iif 4.12 works with lightroom 5