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Installation:
Download the file and drop it into your "game" folder. You should get a prompt to overwrite a file. Select yes. If you don't get the prompt you're probably putting the file in the wrong place.
There's a few events from the 1.8 release that have broken links if you start a
new game. Continuing from the saves you're told to make should be fine. You can use the blue update button in your room to fix these links, which should also just work generally for any broken links as far back as the 1.4 release. Please let me know if the button seems to cause any issues or doesn't fix the links you're expecting.