I was able to get it installed. Took a while. Download ZXP file and use Extension manager to install. It creates a zip file in the download folder. Here is what trip me up the ZIP file has a 7-11 date. So i did find it right away. Once you unzip the zip file it creates the folder Instant Hipster. Right click and select copy on the folder. Then goto Lightroom\Develop Presets\User Presets folder . Easiest way to get to it is going into Lightroom and select 'Show Lightroom preset folder' and then goto Lightroom\Develop Presets\User Presets folder and paste in the folder. Restart Lightroom and it will be in there.
I like the preset. It's just like using Instagram. Hope this helps.