In HPM can you see if HG is installed?
If not try doing a Match Up in HPM.
If it does show maybe try a repair. This should download all the files.
It's been awhile since I installed HG and don't think I had any issues but doing the above might be worth trying.
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Hubitat Package Manager
Repairing Package
Your changes are currently in progress... Please wait...
Downloading https://raw.githubusercontent.com/tchoward/Hubitat/master/HubiGraph.js
Downloading https://raw.githubusercontent.com/tchoward/Hubitat/master/WeatherTile.js
Downloading https://raw.githubusercontent.com/tchoward/Hubitat/master/WeatherTile2.js
Downloading https://raw.githubusercontent.com/tchoward/Hubitat/master/WeatherTile2.css
Downloading Hubigraphs
Downloading Hubigraph Line Graph
Downloading Hubigraph Gauge
Downloading Hubigraph Time Line
Downloading Hubigraph Range Bar
Downloading Hubigraph Bar Graph
Downloading Hubigraph Time Graph because it is required and not installed
Downloading Hubigraph Heat Map
Downloading Hubigraph Weather Tile because it is required and not installed
Downloading Hubigraph Forecast Tile because it is required and not installed
Downloading Hubigraph Radar Tile because it is required and not installed
Downloading Hubigraph Weather Tile 2 because it is required and not installed
Downloading Hubigraph Tile Device
Downloading Hubigraph OpenWeather Device because it is required and not installed
Reinstalling Hubigraphs
Reinstalling Hubigraph Line Graph
Reinstalling Hubigraph Gauge
Reinstalling Hubigraph Time Line
Reinstalling Hubigraph Range Bar
Reinstalling Hubigraph Bar Graph
Installing Hubigraph Time Graph
Reinstalling Hubigraph Heat Map
Installing Hubigraph Weather Tile
Installing Hubigraph Forecast Tile
Installing Hubigraph Radar Tile
Installing Hubigraph Weather Tile 2
Reinstalling Hubigraph Tile Device
Installing Hubigraph OpenWeather Device
Installing https://raw.githubusercontent.com/tchoward/Hubitat/master/HubiGraph.js
Fatal error occurred, rolling back
I'm pretty new here too. More familiar with Vera and learning and liking Hubitat thanks to you with this Hubigraph stuff. I get to JAVA and the instructions trail off for me too. How does one download a .js file? It seems simple...click on link and opt to download but mine comes up in Browser full text and no option to download.