I downloaded 7.2 aprox 4 days ago, wich was 11mb big. Now it's new wersion with same numbers after PR1.3 release with 1 mb less, so it's just 10mb big.
So this other 10 mb (you have to redownload from n9 qtweak thread again) is correct.
Once you have installed this 10mb version:
1. go to the terminal (you must have to tick developer mode under the settings/securty/developer mode and it will install some package by itself).
2. type in:
devel-su (default password is rootme)
3. type in:
apt-get update (wait few minutes to finish)
4. open n9 qtweak (wait few minutes to finish there too)
5. you are ready to use it.

Probably you know how to use terminal app (grey icon with green simbol ~$, but just in case I wrote it