Hello.
I will answer this question.
The new Jup-8 V4 is not an update, it's a brand new product made from scratch.
It's a new code architecture, new DSP/audio engine, new feature set, new 3D and advanced panel interface, new presets.
This means that not a single bit of code remains from the previous version, this is a true full project, with all the costs involved.
Instead of costing 200€, it costs 29€ for the Jup-8 V3 owner, which is a fair deal for a brand new product.
If you don't feel that it is a good deal, sorry for this, but from my point of view, the Jup-8 V4 sounds amazing and worth way more than 29€.
Kind regards
Edouard