Archulas,
Depending on your host, they might (but usually don't if it's a paid host) have file-type restrictions. So if you have a Zip file or an exe or whichever you can upload it to the server via FTP.
I'm not sure if you are familiar with FTP, but if you are you may skip the next paragraph.
To upload files via FTP you'll need an FTP program such as
SmartFTP, which I recommend becuase it's free, secure and easy to use.
If you want folders to be downloaded you can use Windows (I assume you use Windows, forgive me if I'm wrong?) you can simply right-click the folder and zip it, then upload it - should you want to upload downloadable folders.
Hope this helps.
