ketarin basically grabs the html of the download page and compares the version number in the html ,no different in the bandwidth than a person who manually went to the site. I would even say it would use less because it doesnt load the images etc that are on the page, just the html.
the reason for using ketarin is because alot of authors dont want their apps included in a package they want to track the downloads

the /silent switches only allow you to install with no prompts, I would like just the MyDefrag.exe and the scripts in a.zip file on the site with no installer that way i could include it in my ketarin downloader , so it downloads an updated copy to my flash drive and i just extract them to a folder with the ketarin script, the /silent switch doesnt allow me to specify a directory to install to

http://www.whatsmypass.com/tech-toolkit-10 is the ketarin script i am working on that already downloads jkdefrag

i liked jkdefrag because it was portable and i can download the new version and extract it from the zip using Ketarin to update it.
Can you please offer a zipped version for download on your site