Patches, objects, monsters, and files for H3WoG.

I downloaded version 3.58f using Flashget. It took 2 hours to download at a speed of 3-4 KB per second. The connection to the internet was interrupted about fifteen times, and the download speed often dropped to 0: overall, it's a rather buggy program. The folder with the add-on downloaded normally and opened. I started the installation, extracted everything into a separate folder, and ran the Install file. To my surprise, the installation said that all 8 parts were corrupted, even though I had successfully opened them before and even extracted some files.
Why does the installation say that the files are corrupted, and how can I fix this?