Full in Depth New Installation Guide (for Windows)
Step 1: Download both Part1 and Part2 of the game.
Step 2: Use 7zip (or your preferred extractor, but I recommend 7zip) to extract both part 1 and part 2 to your computer, but NOT into the default "programs" or "windows" folders.
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Step 3: Go into the part 2 folder. Then copy the files in that folder.
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Step 4: Go into the Part 1 files and paste the copied files into it.
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Step 5:A window will pop up asking you if yo want to combine the folders, click yes.
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You are done. That is how to correctly install the game.