If install V4.7 - First Install
DownloadThan flow Update
Admin -> General Settings-> Upgrade Software - > Click Update
OpenAIv47to48
Copy the following files and folders
1. Copy LicenseController.php - app/Http/Controllers/Admin/
2. Service.php - app/Services/
3. Delete Folder Users - app/Http/Controllers/Users - Copy Users.zip and Extract
Now v4.8 Working fine