I've just installd IPE R2 (http://nutcom.hu/ipe-r2/) a Raspberry OS based on Buildroot.
How can i install a packet manager or install binaries? May I use the SDK or i can even use the SSH Shell?
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Buildroot itself doesn't have a package manager because it isn't a distribution, although it could be used to create one, as appears to be the case here.
I don't see anything on the IPE website to indicate that they do use a package manager (their own, or someone else's), however, I do notice they have a contact email and surely your best bet is to ask them directly. If it turns out that they do, please come back and provide a better answer to your question!
The goal of producing a read-only system for use in embedded contexts where that level of (uber-paranoid) robustness is required might imply that casual network installation of software isn't desirable, so don't be surprised if you are on your own with that. If I were working on something like this, I'd get a prototype working using something more general purpose first (raspbian, etc.) so that I knew exactly what I needed, and then implement it with the IPE SDK. With regard to updating production systems via a network, it should not be too hard to come up with something custom for exactly that.