should have installed a tool that will allow you to search for and install custom maps in-game. You can find this on the left hand side of the Beat Saber main menu next to release notes. There will be a tab reading “Mods”. Clicking on that tab will offer the option “More Songs...
That's the online fix, not including any method to get custom songs.To get custom songs, go to https://beatsaver.com and unzip the files to the Beat Saber_Data\CustomSongs\ folder, with level name being the name of the level. For one click installs, install mod assistant and move st...