but after ive enabled it and restarted the sim, it does not apear where it should (menu bar/add-ons).
Have you installed the P3D V4 Hotfix ? This has fixed a bug that, if your DLL/EXE.XML files were corrupted by another defective installer of by having hand-edited them, all other executables would be prevented from starting, even those not requiring the DLL/EXE.XML files anymore, like our own.
So, if you don't have the Hotfix installed, you had to fix the DLL/EXE.XML files or, you can just install the Hotfix, which will fix this problem.