This nvim configuration does not use any plugin manager. I took some code and ideas from https://github.com/echasnovski/nvim

./add-plugin.sh https://github.com/<plugin-path> <plugin-name-no-extension>

Then edit lua/plugins.lua and add the code to load:

packadd_defer('<plugin-name-no-extension>')
vim.schedule(function()
  <setup code from plugin docs>
end)

If the deferred loading does not work try using packadd instead of packadd_defer.

./update-plugins.sh

git submodule deinit pack/plugins/<path-to-plugin>