Working with the Installer

I wanted to test a function of the installer. So I went to the fosdem.wikiation.nl and ran the "update_self" functionality. This broke the installer. So I deleted the installer directory and installed the installer again from the documentation.

This worked fine. To my delight I got the following welcome message:

****************************************
=== Wikiation installer (v. 48376) ===

(last known safe version: 48307)
Interactive mode. Automated testing is disabled.

please type a command and hit enter
help for help
^D, or quit to quit
****************************************

So there is now the latest version or the latest safe version. Now I have to learn how to install the revision that I want to test because that needs to end up in the documentation.
Thanks,
GerardM