Hmm gosh it's been so long since i had to deal with them particular issues lol I'll take a gander..
1. the only thing I can think of is how your payment setting is done. Like in paypal I got it set to pending>processing. I'm sure there another way, as mine has done automatically but I can't find where I did the adjustments.
2. You may have done this already, but be sure that your download item is actually loaded into the download folder only and not anywhere else. You shouldn't have to load it in any other folder as the pub is a temporary area for redirected files. Make sure that the file is deleted from pub folder.
AND/OR
Your not set to "accept" that file type. Go under Configuration in you admin area and go into Maximum Values and scroll near the bottom till you find the "Allowed Filename Extensions for uploading" and there should be a list of the current files allowed, simply type in the rar file and update and that should work. Just follow how the other file types are listed, with no spaces and commas.
Hope that helps ^^
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