With windows that generally just means you inadvertently downloaded the same file twice. When downloading if there is a file with the same name windows doesn't ask of you want to overwrite. IT just supplies the new name XXX(1). More than once I have mistakenly downloaded the same file. Just check and see if the files size match.
Not inadvertently, but did not cared if same already downloaded.
When I download from the Forum, say, any examples, I may have already but do not waste time in looking and download it, knowing very well that I will have twice or thrice of same copy. I clean up my download folder when I am looking for something and find many (1) (2) etc.