How do I install a local nimble file that I downloaded from github?
I tried nimble install filename and it complained that it wasn't found in local packages.json.
cd projectdir
nimble develop
You don't install nimble files, you install packages. Nimble file is just meta for a package. So downloading the file alone won't do.
When you've cloned the repo, you can run either nimble install` or `nimble develop in the repo folder to install the package or install in development mode respectively.