Lost iMovie, iPhoto and iDVD when hard drive crashed.

I owned my iMac since 2007 and my first OS was 10.4. As far back then, my iMac came with iMovie, iPhoto and iDVD already installed. Since 2011, I had OS 10.6 on my iMac. Two weekends ago, my hard drive crashed and lost many applications, including iMovie, iPhoto and iDVD. I still had a copy of 10.6 on a disc and reinstalled it and even updated it to the version I had before my HD crashed. I notice that iMovie, iPhoto and iDVD are not in my computer anymore.

I visited the download section on the Apple website and have found versions of iMovie, iPhoto and iDVD that would be compatable with OS 10.6.8, but for some reason I can't install them. I was able to install iPhoto, but can't open it. I can't even install iDVD. I haven't tried to install iMovie.

Is there any way I can install these applications I lost? I realize purchasing a new copy of iLife is one option, but the version that is out now is not compatable with OS 10.6.8.