docs: add exerpt on packer plugins install --path

command/init.go

@@ -169,7 +169,7 @@ Options:
                                version, if there is a new higher one. Note that
                                this still takes into consideration the version
                                constraint of the config.
-  -force                       Forces installation of plugins, even if already
+  -force                       Forces reinstallation of plugins, even if already
                                installed.
 `
 

command/plugins_install.go

@@ -54,7 +54,7 @@ Options:
                  not try to download it from a remote location, and instead
                  install the binary in the Packer plugins path.
 	         This option cannot be specified with a version constraint.
-  - force:       forces installation of a plugin, even if it is already there.
+  - force:       forces reinstallation of plugins, even if already installed.
 `
 
 	return strings.TrimSpace(helpText)

website/content/docs/plugins/install-plugins.mdx

@@ -227,5 +227,15 @@ If you have a `required_plugins` for the plugin you're manually installing, make
 it respects the constraints described in the [Plugin loading workflow](#plugin-loading-workflow)
 section, otherwise Packer will not be able to load it.
 
+Starting with v1.10.0 of Packer, you can also use `packer plugins install` with the
+`--path` flag to install a plugin from a binary, following the layout that is required to
+work with `required_plugins` block.
+
+```shell
+packer plugins install --path <path-to-plugin-binary> github.com/hashicorp/vagrant
+```
+
+-> packer plugins install --path only works with release versions of plugins.
+
 </Tab>
 </Tabs>