LCPDFR Installation

So a month or so ago I bought GTA IV on steam and played it, it worked, I installed LCPDFR, the installation worked, but the game didn't launch. I did some research, found out that it was the whole deal with patch 8, but I couldn't figure out how to downgrade, so I got a refund and said screw it. Well, this week I did more research and figured out how to downgrade, so I bought GTA IV again, downgraded to patch 7, played, it worked. Then I tried to Install LCPDFR, but on the last step, where there's a check box that says "Launch LCPDFR configurator", the box was checked, and I hit finish and nothing happened. I didn't think anything of it, and started the game. I went outside, hit alt-P (I believe that's the default control to launch LCPDFR) and nothing happened other than the resolution changed, which is because rockstar set the P key to do that. So I went back into my GTA IV folder and found a "LCPDFR Diagnostics Tool." When I click "Configure LCPDFR", it does the same thing as when I finished the installation, it thinks it opened the configurator but nothing happened. I then went back into the diagnostic tool and clicked the verify installation, and 2 windows open. One is an empty window that looks like the diagnostic tool is supposed to but there are no words, and the other window is from windows saying that the diagnostic tool has stopped working. Any ideas why or what to do? I've tried installing with the "no ads automatic installer" and also with the manual installation. If any log files or screenshots of folders are necessary I can provide them