So, I installed RPM succesfully. Then I fucked up in way or another installed software's config, so I needed to install RPM again.
Then comes problems.. I deleted install directory manually(rm -fr ..)..
I should un-install with rpm -e .., but I didnt.. smart, eh?
When I try to uninstall it, it says that it can't access to that directory, which I deleted manually.
So now I can't install RPM, cause last RPM is still installed. How can I force RPM to uninstall that software?