Check the table at the below link, and look for the row Additional add-on files. You will hopefully have one of those folders, into which you need to copy the jar file.
They claim to be their own OS and there is not official installation for that OS. Perhaps they can better support that binding. There is no official OH binding with that name.
Perhaps there’s some confusion here. @Superpedro only said openHAB is installed on top of max2play. Nothing about a max2play binding. He’s actually trying to install the WLED binding which is actively maintained by @matt1
There is now, the binding got merged around 5 days ago and is showing up in openhab 3 in the snapshot builds. It won’t show up in the docs until openhab 3 stable is released when all the docs will change to showing the V3 versions.