The plugin isn't available on the plugin store yet, and has to be downloaded manually from the github.
Also general reminder that framegen isn't recommended to be used under 60fps according to AMD. It will work, but you can get really bad input lag. It'll depend on your own tolerance for input lag and the type of game for whether this will be a viable option for you.
Frame generation will make your game feel more fluid at (minor) expense to input lag by generating "in between" frames. It works like Nvidia's DLSS 3 but on any graphics card because AMD open sources it
It will make it look more fluid. It will feel like it's running at a lower framerate, and at the framerates BG3 runs at on the Deck, around 25fps or 40ms per frame, the increase would be quite noticeable.
Been waiting for this. For those who want to install it before it is officially released. Download the zip file from their GitHub, Enable the developer option in decky loader then choose install plugin from zip file