Unable to install/use this package

I ran into this to consider using keys as any dataType but not limited to comparable.

I tried moving the source code (elm modules) for Hash.Dict and it's dependent modules to my local directory of the project but hit this here in [src/Hash/FNV.elm](https://github.com/elm-explorations/hashmap/blob/master/src/Hash/FNV.elm)
```
MODULE NOT FOUND - You are trying to import a `Elm.Kernel.FNV` module:

3| import Elm.Kernel.FNV
#^^^^^^^^^^^^^^#
I checked the "dependencies" and "source-directories" listed in your elm.json,
but I cannot find it! Maybe it is a typo for one of these names?
```
This import is causing the issue:
```
import Elm.Kernel.FNV
^^^^^^^^^^^^
```
My understanding is that it is the compiled code (.js file) and not an elm module which can be consumed directly and I am unable to consume this package locally.

I considered using this but it's unsupported for v0.19 due to certain reasons:
#https://github.com/gdotdesign/elm-github-install/issues/62

Is there a way to install this module locally it being not available through package manager for installation.