Let me be as clear as possible. Alot of those solutions in your response do not relate to my issue. I am not able to install lcpdfr 1.1 at all...so alot of your solutions do not apply to me. I do, however, have a Steam purchased copy of gta IV. Let me explain my problem. After downloading LCPDFR 1.1, I open it to install and then I get an NSIS error message saying that the file that I am attempting to download(LCPDFR 1.1) has failed an Intergrity check. It then tells me that i should contact the author and get a new copy of the file. I was able to download and install version 1.0d though. Ive been playing the old version and while its enjoyable...I hate to be playing behind the rest of the community. I have tried to download the manual installation and when I open it up in winrar...it tells me that the file is damaged or corrupt. I get a "unexpected end of archive" error and they say all the files needed are not there. Also i didnt download 1.0d until after i tried installing the current version serveral times.