RAI is Troy’s rapid app installer. You can use it to quickly install some of the top cord cutters apps. A kodi fork is a stripped down Kodi without any addons or any “builds”. This makes it smaller and thus easier to run on low specs devices like Firesticks that have very little storage, and you are the able to install a couple or so addons without negatively impacting the sevice.
Kodi forks do not contain any addons. They are like a stripped down basic vehicle, then you add say GPS, a top line Sound System, fancy rims, a moon roof etc. etc. and make the vehicle your own pimped out ride.
In the Crewnique Build somewhere in the settings you will find file manager. Once you find this then following Troy’s tutorial you can add any addon. Good luck Just remember Troy’s tutorial is done on a plain kodi so it will differ a bit. After you add the url in the file manger then you need to find the setting called addon browser that’s where you’ll find install from zip file and install from repository. After its installed you go into addon browser click my addons or all addons then click video addons and it will be in there
No you can install add on"s on top of the build if you want to see the original kodi menu you just need to change the skin back to the original kodi skin. I think Troy has a tutorial on the site just search it.