YO! DETTA GJORDE SUSEN! NU FUNGERAR DET:
Ste (admin of Istaller app) has moved the repository from one site to another. So, you're getting the package download failure notices because most of the files simply AREN'T THERE anymore.
The only thing to do is to change the URL of "Ste Packaging" to http://repo.smxy.org/iphone-apps/ in the Sources section of Installer app.
Or (preferred) simply install Community Sources (can be found in Sources among the installs) it does the same automatically.
If you've installed Community Sources or changed the URL manually, you'll be able to get those installs.
* please spread the word, I saw people asking the same question on many sites! *