How do I save a .xcf file as a jpg/JPEG?

Ok, I got a question about GIMP, I have made an awesome
picture, but I can't save it as a .jpg

It says it needs a plugin, but where can I find it or how do I
save it as jpg?

How do I save a .xcf file as a jpg/JPEG?

no additional plugin is needed, to save as jpg, if gimp was correctly installed is only needed to add .jpg after the image name in the Save AS or " Save Copy as " dialogs
(at least if you did not change default save option)

As example if your want call your image "my-image" to save as jpg you just wrote there " "my-image.jpg "

If then you get message about missing plugin then is probable you downloaded a corrupt installer

Ok... But then where can I

Ok... But then where can I download this ''corrupt installer''..?

Just download GIMP once

Just download GIMP once again from www.gimp.org, then it should work.