In principle, a Usermod is an extension that a user/programmer can program in addition to the basic functions of the WLED software. In order to be able to use a Usermod, it must be compiled together with WLED software. Official WLED releases do not contain any Usermods, unofficial sources such as WLED Installer also offer pre-compiled WLED versions with some Usermods included. In many cases, however, this means that if you want to use one or more usermods, you have to compile WLED software for them yourself. This WLED Online Compiler can be useful. It is also important to note that some usermods may be outdated and may not work correctly or not at all with the current WLED version, because user mods were not programmed by the WLED community, but often by individual users/developers and are therefore not well maintained or not kept up to date.