When you get this error you will check a few points
1. If sub-domain or folder check that folder permission 755 2. Check .env file permission 644 3. Check the index.php permission 755 4. Make sure your folder name is a small letter, not a CAPITAL letter
After finishing, the changes now enter the URL you will see auto-show install, as our system doesn't have an install folder If you try to enter this location may not work if have a permission issue.
Make Sure you have permission with 777 by following this Folder with the Sub-Folder below processed: