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for scripts just extract the .zip file you can download from the forums to the "Scripts" folder.
for plugins the same in the "plugins" folder but do not extract the .jar file that will be created after the first extraction.

As @Minotorious said:

*) For old LUA scripts, the one you can download from the LUA Scripting forum section, they have to go in the server scripts folder, a sub-folder for each script;

*) For new Java plug-ins, the ones you can downloaded from the Plugins forum section, they have to go in the server plugins folder, again a sub-folder for each plug-in.

You screen shot does not show a plugins folder, then you have to create one with the New folder button. Please keep the capitalisation (actually, the lack of it) as shown above, as upper/lower case is significant in some operating systems and using Plugins instead of plugins would be enough for the plug-ins not to be recognised.

As a general rule, any and each of the files you find in the archive (ZIP or whatever) you downloaded has to be uploaded to the proper server sub-folder, regardless its type: if it is there, it usually means it is required by the script/plug-in. If the archive you downloaded has its own sub-folders, they too have to be uploaded to the script/plug-in own folder.

In practice, once you unZIPped the downloaded archive locally on your computer, its whole file structure has to be uploaded to the script/plug-in own sub-folder as it is.

The bare minimum files you will get are:

*) for old LUA scripts, a <some_name>.LUA file and a definition.xml file;

*) for new Java plug-ins, a <some_name>.jar file.

But, as I said, there might be more and all of them need to be there in the server.

ok if it has a .jar file then you are talking about a plugin and NOT a script. considering the extensions .dds and .car I think you are talking about the SimpleCars plugin. In that case the only thing you need to extract is the SimlpeCar v1.5.4.zip and upload the folder SimpleCar as it is (i.e. with all its contents, assets folder, jar file and the three png files) in the server plugins folder. If you want to add the other vehicles then you should unzip and upload all the files to the assets subfolder in the SimpleCar directory.

ok does your file system structure look exactly like this?

RisingWorld <-directory
---plugins <-directory inside RisingWorld
------SimpleCar <-directory inside plugins
---------assets <-directory inside SimpleCar
---------SimpleCar.jar <-jar file inside SimpleCar directory
---------bg_speedometer.png <-image inside SimpleCar directory
---------gasstation.png <-image inside SimpleCar directory
---------screwdriver.png <-image inside SimpleCar directory

I am sorry but I really cannot understand your problem if your filesystem structure looks exactly like that, which it should if you just extracted the zip file and uploaded the folder created directly to the server plugins directory. The plugin should work on your server. I know of at least one server that was using this specific plugin without problems.

Quote from Xantheos

shouldn't the *.jar file go into the "lib" folder with all the other *.jar files?

no the lib directory is for the game jar files, you shouldn't change anything there or your game may stop working properly.