It is possible that the cache folder is corrupt and because of it, the mods are not loading.

Here updating the game to the latest version fixes the issue instantly. You need to make sure it is enabled before the mods can be loaded in the game engine. Normally, this option is disabled by default.

If this isn’t the case, the mods will fail to work. In order to properly place them in the correct location, you need to unzip them and then place the contents. zip format: The mod files which you download through the internet are in a zipped format.