For Litespeed server, there’s 404 problems on installing WordPress for the first time, which is occurring due to misconfiguration with HTaccess tag.

To fix the problem, just follow the following steps;

1. Open DA panel with credentials
2. Go to File Manager > Domains > public_html of specific domain
3. Edit HTaccess tag, then replaces the current codes with following one

RewriteEngine On
RewriteBase /
RewriteRule ^/index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

4. The save it, reload your page, everything done.