The release candidates are not released in the 7z form. However, according to the developer, there will be a new version/build in the 7z (standalone) eventually. You'll have to wait a bit.
I too am waiting for a zip version of mediacoder 0.7.0. I understand that release candidates are available only as exe files, but then 0.7.0.4380 is not in RC, unlike the last few versions. I tried the 7-zip thing, it unpacks fine but i get a "Error initializing core engine".
Thank you for the 7-z version , works perfectly fine over here. Will you be putting a link to the files somewhere on the site? Because I noticed that links to the zip version are no longer on the 0.7 page.