Website redirecting to wp-admin/install.php

I’m not too sure I understand the question, but I believe your website is redirecting to wp-admin/install.php and this is sometimes a common issue.

Refer to here to find solutions that might work for you:
http://codex.ww.wp.xz.cn/Editing_wp-config.php

Check the database name, username, password and table prefix in the wp-config.php file.

Check if the wp-config.php file exists and the file has not been misspelled in the name or the extension.