Thanks Jochen,

Those are some good points, @mabula-admin can chime in, I think it's always difficult to decide what constitutes a proper upgrade that merits an additional fee. Personally I would say something like a whole new post-processing feature or workflow maybe.. but again, I'm not the devloper. 😉

Thanks Vincent, for prompt reply, but unfortunately that didn't answer my question. I'd appreciate a rough idea on frequency and cost of the major upgrade. For instance my RAW editing software, (DXO PhotoLab) has a similar model to the APP Owner license. Their owner license is 129.- and they release a major update every 2 years which sets me back some 50.-. This gives me a clear expectation about the total cost of the product. This would help to compare the cost of APPs rental model vs. owner model.   

I fully understand Jochen, I've asked Mabula to chime in.

I didn´t receive a on this response yet, I appreciate Mabula is busy with 0.75 release.

However, I am now unsure about owners license. Buying now, will release 0.75 require more payment or will it be  included/considered minor? 

Mid term he really should provide a bit more clarity on major update costs and cycles   

Sorry about that, I've messaged Mabula so I hope he's available soon (it's indeed very busy before this release).