3534f plugins are compatible with kX version 3534f.
3537  plugins are compatible with kX version 3537.
3538h plugins are compatible with kX version 3538h.
3538i plugins are compatible with kX version 3538i or 3538j.
3534j plugins are compatible with kX version 3538j (3538i).
3538k plugins are compatible with kX version 3538k, 3538L, 3538m.
3538L plugins are compatible with kX version 3538L or 3538m (3538k).
3538m plugins are compatible with kX version 3538m (3538L or 3538k).
3539  plugins are compatible with kX version 3539 - 3545.
3540  plugins are compatible with kX version 3540 - 3545 (3539).
3541  plugins are compatible with kX version 3541 - 3545 (3540 or 3539).
3542  plugins are compatible with kX version 3542 - 3545 (3541 - 3539).
3543  plugins are compatible with kX version 3543 - 3545 (3542 - 3539).
3544  plugins are compatible with kX version 3544 - 3545 (3543 - 3539).
3545  plugins are compatible with kX version 3545 (3544 - 3539).
3548  plugins are compatible with kX version 3548 - 3550
3549  plugins are compatible with kX version 3549 or 3550 (3548).
3550  plugins are compatible with kX version 3550 (3549 or 3548).
Indicates probable backward compatibilty (untested).