first upload all files

app/Http/Controllers/InstallController.php

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+<?php
+
+namespace FleetCart\Http\Controllers;
+
+use Exception;
+use FleetCart\Install\App;
+use FleetCart\Install\Store;
+use FleetCart\Install\Database;
+use FleetCart\Install\Requirement;
+use Illuminate\Routing\Controller;
+use FleetCart\Install\AdminAccount;
+use FleetCart\Http\Requests\InstallRequest;
+use Jackiedo\DotenvEditor\Facades\DotenvEditor;
+use FleetCart\Http\Middleware\RedirectIfInstalled;
+
+class InstallController extends Controller
+{
+    public function __construct()
+    {
+        $this->middleware(RedirectIfInstalled::class);
+    }
+
+    public function preInstallation(Requirement $requirement)
+    {
+        return view('install.pre_installation', compact('requirement'));
+    }
+
+    public function getConfiguration(Requirement $requirement)
+    {
+        if (! $requirement->satisfied()) {
+            return redirect()->route('install.pre_installation');
+        }
+
+        return view('install.configuration', compact('requirement'));
+    }
+
+    public function postConfiguration(
+        InstallRequest $request,
+        Database $database,
+        AdminAccount $admin,
+        Store $store,
+        App $app
+    ) {
+        @set_time_limit(0);
+
+        try {
+            $database->setup($request->db);
+            $admin->setup($request->admin);
+            $store->setup($request->store);
+            $app->setup();
+        } catch (Exception $e) {
+            return back()->withInput()
+                ->with('error', $e->getMessage());
+        }
+
+        return redirect('install/complete');
+    }
+
+    public function complete()
+    {
+        if (config('app.installed')) {
+            return redirect()->route('home');
+        }
+
+        DotenvEditor::setKey('APP_INSTALLED', 'true')->save();
+
+        return view('install.complete');
+    }
+}

app/Http/Controllers/LicenseController.php

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+<?php
+
+namespace FleetCart\Http\Controllers;
+
+use FleetCart\License;
+use Illuminate\Routing\Controller;
+use FleetCart\Http\Middleware\RedirectIfShouldNotCreateLicense;
+
+class LicenseController extends Controller
+{
+    public function __construct()
+    {
+        $this->middleware(RedirectIfShouldNotCreateLicense::class);
+    }
+
+    public function create()
+    {
+        return view('license.create');
+    }
+
+    public function store(License $license)
+    {
+        request()->validate([
+            'purchase_code' => 'required',
+        ], [
+            'required' => 'The purchase code field is required.',
+        ]);
+
+        $license->activate(request('purchase_code'));
+
+        return redirect()->intended();
+    }
+}