Hey.
I've never played LCPD:FR until now. Though I still remember how much I wanted to try it and recently I got over that Patch 8 problem. I have steam edition.
There might be somebody who is experiencing the same problem and who doesnt want to wait, so sorry if that is the wrong thread to post to.
Here is what I've done to get it working.
First you need to downgrade to 1.0.7.0, of course. All suggestions to download the Title update patch from Rockstar didnt work for me. The problem was that none of the both installers could locate the game. So I found the link to the extracted content of the update: Boom. Once you download it you will have to copy and replace these files to your original "GTAIV" folder. In-game you'll probably run into 800x600 resolution and Resource usage bug, here is the Youtube vid that should help. Fiddle with "-availablevidmem" numbers though, it doesnt display correct all the time. Don't exceed your real memory.
Install LCPD:FR into your GTAIV folder. It might want to create one more folder inside it, but you need to choose exactly GTAIV. Also make sure you have the x86 version of this Microsoft Visual. If it states Repair or cancel, then press Repair. After all this you might wanna check if everything is ok. Find the LCPDFR folder inside GTAIV, there will be a diagnosis tool. Run a diagnosis, and if everything except Log check is green, then you're cool and can press Alt+P to start playing. I dont know how fatal Log check is, but everything works fine for me. One more thing: you should probably connect to GFWL when playing and not from the main menu, I had my game frozen after this.
Again, just in case nobody has already posted his/her effective solutions and I didnt just waste my time flooding.
Hope this helps. Cheers.