I have recently posted a map, and I have noticed a problem with the map, and every time i try to update it, it just downloads the old version. what do i do?

Edit the download and make sure the new file you are uploading has a new filename. It will not overwrite the old file.

k thx

When you edit your download, at Release Options, just select "Replace the following release with the new file", Current file. That way you can have the same filename, the old one will be overwritten, and there will be only one file (will not keep previous versions)