I think that the Software Updater is a good idea, but on noticing that it claimed 7-Zip Filemanager (9.20) needed to be updated, I did so thinking that I was not aware of the new update.
In fact, it updated to 7-Zip 9.22, which is in fact a beta. Although I believe it has been a beta for at least three years.
I have 7zip 9.32 (alpha) released on 01-12-2013
Avast shows that there is not a newer version although there is version 9.34 (alpha) released on 22-06-2014.
Maybe it works for the 64 bit version, the 32 bit version updated on my x86 laptop, but when I checked 7-Zip itself it claimed to be a beta. So I reinstalled the stable release 7-Zip from the installer.
Maybe you should check whether yours is the beta or not. It probably doesn’t matter though, it appears however that development of 7-Zip has halted for a while.
Wiki:
Initial release 18 July 1999[1]
Stable release 9.20 (November 18, 2010; 3 years ago) [±][1]