Update of EPM 12.1.4023.4080

Dear Community,

currently we have installed

EPM: 12.1.4023.4080 -> RU 4a

Endpoint Protection-Client: 12.1.4013.4013

Is it possible to update the EPM with RU4 MP1b (12.1.4112.4156) or rather RU4 MP1a (12.1.4104.4130) ?

Does anything have to be done with the clients?

Besides, we have the problem that the clients won't update since the update from EPM 11, only when triggered manually.

Thanks a lot