diff --git a/pkg/cmd/extension/command.go b/pkg/cmd/extension/command.go
index 8153ef5e4..9ac5e5f21 100644
--- a/pkg/cmd/extension/command.go
+++ b/pkg/cmd/extension/command.go
@@ -105,38 +105,20 @@ func NewCmdExtension(f *cmdutil.Factory) *cobra.Command {
 					return err
 				}
 				if err := checkValidExtension(cmd.Root(), m, repo.RepoName()); err != nil {
-					// TODO i feel like this should check for a gh-foo script
 					return err
 				}
-
 				client, err := f.HttpClient()
 				if err != nil {
 					return fmt.Errorf("could not make http client: %w", err)
 				}
 				client = api.NewCachedClient(client, time.Second*30)
 
-				isBin, err := isBinExtension(client, repo)
-				if err != nil {
-					return fmt.Errorf("could not check for binary extension: %w", err)
-				}
-				if isBin {
-					return m.InstallBin(client, repo)
-				}
-
-				hs, err := hasScript(client, repo)
-				if err != nil {
-					return err
-				}
-				if !hs {
-					return errors.New("extension is uninstallable: missing executable")
-				}
-
 				cfg, err := f.Config()
 				if err != nil {
 					return err
 				}
-				protocol, _ := cfg.Get(repo.RepoHost(), "git_protocol")
-				return m.InstallGit(ghrepo.FormatRemoteURL(repo, protocol), io.Out, io.ErrOut)
+
+				return m.Install(client, repo, io, cfg)
 			},
 		},
 		func() *cobra.Command {
diff --git a/pkg/cmd/extension/manager.go b/pkg/cmd/extension/manager.go
index 393e8ef82..ddfbde3fc 100644
--- a/pkg/cmd/extension/manager.go
+++ b/pkg/cmd/extension/manager.go
@@ -19,6 +19,7 @@ import (
 	"github.com/cli/cli/v2/internal/ghrepo"
 	"github.com/cli/cli/v2/pkg/extensions"
 	"github.com/cli/cli/v2/pkg/findsh"
+	"github.com/cli/cli/v2/pkg/iostreams"
 	"github.com/cli/safeexec"
 	"gopkg.in/yaml.v3"
 )
@@ -187,6 +188,28 @@ type BinManifest struct {
 	Path string
 }
 
+func (m *Manager) Install(client *http.Client, repo ghrepo.Interface, io *iostreams.IOStreams, cfg config.Config) error {
+	isBin, err := isBinExtension(client, repo)
+	if err != nil {
+		return fmt.Errorf("could not check for binary extension: %w", err)
+	}
+	if isBin {
+		return m.InstallBin(client, repo)
+	}
+
+	hs, err := hasScript(client, repo)
+	if err != nil {
+		return err
+	}
+	if !hs {
+		// TODO open an issue hint, here?
+		return errors.New("extension is uninstallable: missing executable")
+	}
+
+	protocol, _ := cfg.Get(repo.RepoHost(), "git_protocol")
+	return m.InstallGit(ghrepo.FormatRemoteURL(repo, protocol), io.Out, io.ErrOut)
+}
+
 func (m *Manager) InstallBin(client *http.Client, repo ghrepo.Interface) error {
 	var r *release
 	r, err := fetchLatestRelease(client, repo)
diff --git a/pkg/cmd/extension/manager_test.go b/pkg/cmd/extension/manager_test.go
index c03d3fa62..80a535c40 100644
--- a/pkg/cmd/extension/manager_test.go
+++ b/pkg/cmd/extension/manager_test.go
@@ -44,7 +44,7 @@ func newTestManager(dir string) *Manager {
 			return cmd
 		},
 		platform: func() string {
-			return "amiga-arm64"
+			return "windows-amd64"
 		},
 	}
 }
@@ -222,7 +222,7 @@ func TestManager_InstallBin(t *testing.T) {
 			release{
 				Assets: []releaseAsset{
 					{
-						Name:   "gh-bin-ext-amiga-arm64",
+						Name:   "gh-bin-ext-windows-amd64",
 						APIURL: "https://example.com/release/cool",
 					},
 				},
diff --git a/pkg/extensions/extension.go b/pkg/extensions/extension.go
index 6102c1e9a..99087fe04 100644
--- a/pkg/extensions/extension.go
+++ b/pkg/extensions/extension.go
@@ -4,7 +4,9 @@ import (
 	"io"
 	"net/http"
 
+	"github.com/cli/cli/v2/internal/config"
 	"github.com/cli/cli/v2/internal/ghrepo"
+	"github.com/cli/cli/v2/pkg/iostreams"
 )
 
 //go:generate moq -rm -out extension_mock.go . Extension
@@ -19,8 +21,9 @@ type Extension interface {
 //go:generate moq -rm -out manager_mock.go . ExtensionManager
 type ExtensionManager interface {
 	List(includeMetadata bool) []Extension
-	InstallGit(url string, stdout, stderr io.Writer) error
-	InstallBin(client *http.Client, repo ghrepo.Interface) error
+	Install(*http.Client, ghrepo.Interface, *iostreams.IOStreams, config.Config) error
+	InstallBin(*http.Client, ghrepo.Interface) error
+	InstallGit(string, io.Writer, io.Writer) error
 	InstallLocal(dir string) error
 	Upgrade(name string, force bool, stdout, stderr io.Writer) error
 	Remove(name string) error