Nginx install troubles... default config and SSL

https://pastebin.com/kCrgE6VB is my nginx config. Using nginx because another application uses it by default. Using certbot and cloudflare, all settings off and proxying disabled.
When running install script through web, i encounter the issue of index.php being downloaded instead of displayed. Previously, look at my other post. I see “Nextcloud has been installed” and then “next” downloads “index.php”.

this is my 6th or 7th try to install… look at my forum post for my other problems. Begging for some help on this. Thanks!