that will depend if using openatv or vix I think for vix you can install from plugins\extensions, openatv from feed. also if using a build most have it already.
I just use the ones from feed now on another forum far to many versions about updates every other day by far to many people.You can download oscam from the plugin feeds on most images OpenATV needs the softcam feed installing though.
They may not be the latest version on the softcam feed but the updates to Oscam lately wont make much difference if your client only.
As a novice who had only used zgemma hs2 and zgemma h9 combo I had to make choice between Vu+Duo 4k SE and the Gigablue UHD quad 4k went with the gigablue was still cheaper even when adding extra tuners and hard drive than the VU. was going to buy the zgemma h7s great box but I did really like the FBC tuner option on both machines, I have also noticed even though broadcom chipset is older and only duel proccessor on the gigablue it will record anything even iptv without having to change to (DVB) 1 on zgemma combo it would crash on old zgemma hs2 no problem different chipset again.You see the thing there is Vu= reliability owned many models and still have an old duo2 they just go on and on.
I'll flip a coin at the time.